To reach the color wheels, we must remove the lamphouse cover. This PCB doesn't actually have to be removed, but all the wires going to it must be disconnected.

PD was very considerate in manufacturing these projectors -- there are labels on the cable and on the PCB connector.

Starting at the large ZIF ribbon cable, and naming them clockwise, we have: IO card ribbon cable, DC POWER IO, Fan Main, IR, Fan Ctrl VDI, Fan Lamp Driver, [lamp blower fan], Temp Lamp, Lamp Memory, Lamp 2 (switch), CW2, color wheel 2 ribbon, color wheel 1 ribbon, CW1, Lamp 1, Lamp Memory, Temp Out, [lamp 1 blower fan], Fan Lamp Driver, LMP Ctrl VDI, IR2

Well, most of my cables were well-labeled. Some, though, are close together enough and similar enough to possibly be confused. So, I suggest labeling connector and cable with marker to distinguish them. See example in pic 3 -- these are ribbon cables for the color wheel motors, and the 3-wire connectors for the position sensors.