@212man
#38 correct. 2 x ENG beep trim switches for A/C, mounted on collective head, one for each engine, to adjust load sharing between the engines, and to set engine output (rotor) speed, and the governors are still governing whilst you're beeping etc etc.
C+/++ is fundamentally different. There is a single spring centred switch on the collective (seen in #30) that is only active with an engine/s in manual mode, that is, with the electronic engine governing taken out of the equation for that engine. The switch is activated automatically by the DECU (C++) when both A and B channels have failed, most likely indicated with blue engine control light ON and IIDS warning. Alternatively the pilot can manually control engine power with this switch via an overhead 3-position magnetically latched switch, by selecting #1 manual or #2 manual. The spring centred switch on the collective will control the power output (increase or decrease) of the engine in manual control, or both engines together if DECU channel A & B both fail on each engine.
The pilot is then entirely controlling the manual engine/s power with this collective switch (which electrically drives the fuel metering valve in or out as per pilot command). A pilot can't select both engines to manual because the 3 position switch that controls the function doesn't physically give you that option. There is other logic built into the switch operation, e.g. a pilot can't put a good engine into manual mode with a double channel DECU failure on the other engine, blah blah.
The C+/++ description above is not entirely applicable to C+, but they share enough similarities to be grouped together, whereas A/C are entirely different.
Sorry for rambling on, I get carried away sometimes.