Input section along top panel, from left to right:
First 4 inputs are female XLR sockets for microphones, M1, M2, M3 and M4 respectively.
Aligned below each XLR you'll find four female 1/4 jacks, first two are Line/Inst, third and fourth are Line.
Moving right, you'll find a group of four female 1/4 jacks arranged in a square. These are inputs for stereo 1 and stereo 2 channels. For each channel, left and right are top and bottom respectively.
Moving right again, you'll find two female phono sockets arranged vertically. These are Monitor Out. Left is top, right is bottom.
USB type A socket is directly below the Monitor Out phonos.
At the top right hand side corner, there are two male XLRs aligned horizontally. These are Main Outs, left then right.
Below the Main Outs are two female 1/4 jacks, left is Auxiliary Out, right is FX Out.

Channel strips 1 and 2, working from the top downward.
Gain knob (5dB is full left, 60dB is full right)
Hi-Z latching button for instrument input (on is in)
Low Cut latching button (on is in)
Three-band EQ, HF, MF and LF (high mid and low frequency)
Auxiliary Return knob (minus infinity is full left, Unity is pointed at 3 o'clock, +6dB is full right)
FX Return knob (minus infinity is full left, Unity is pointed at 3 o'clock, dB is full right)
Pan knob
Mix knob, what would traditionally be a fader for the channel strip (minus infinity is full left, Unity is pointed at 1 o'clock, +10dB is full right)
Headphones latching button (on is in).

Channels M3 and M4 only have one difference:
Latching button underneath gain knob is Line/Pad -20dB (padded is in).

Stereo 1 channel strip, top to bottom:
Gain knob (minus infinity is full left, +15dB is full right)
Two-band EQ, HF and LF (high and low frequency respectively)
Aux Return
FX Return
Balance knob
Mix knob
Headphones

Stereo 2 and 3 channel strips, top to bottom:
Aux Returns in line with earlier strips
Alan and Heath raised shiny name plate thing (mentioning as it might be useful as an orientation landmark)
Mix knobs in line with earlier strips
Headphones latching buttons at bottom of strips as usual.

Routing section to the right of channel strips, starting from the left-most controls, working top to bottom each time:
Source selectors are above the controls for stereo 3 strip. Two latching buttons arranged vertically:
Top button is labeled "M1 - M2 - L - R"
Bottom button is labeled "M1 - M2 - Aux - FX".
Moving to the right, just underneath the Main Out Left male XLR connection, you'll find two knobs arranged vertically with a single latching button positioned below and slightly to the left. These are:
Aux Master (minus infinity is full left, Unity is pointed at 3 o'clock, +6dB is full right)
Monitor Out (0 to 10)
Monitor Source latching button (Phones is out, Mix is in)
Below those knobs, you'll find the single Mix fader (Unity is three quarters up, +10dB is all the way up).
Underneath Main Out Right male XLR, you'll find two latching buttons arranged vertically:
Top button is labeled "XLRs = Mons"
Bottom button is 48V Phantom Power (on is in).

Headphones section down the right hand side, from top to bottom:
Phones volume knob (0 to 10)
Three latching buttons arranged vertically, labeled "Phones Select":
FX Send
Aux Send
ST3 In
Female 1/4 headphones jack

Back panel:
Kensington lock slot is above the left most heat vent
Power socket is further to the right near the bottom of the panel
Power switch is further right (on is flipped down)

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