TQ Gauge Fluctuating Question
vfr440 is absolutely correct that the Px and Py bleeds are in the FCU, my mistake - I haven't worked on this engine for some time. But I do remember removing and cleaning a bleed orifice (Pg?) on the PTG and that it can be done without removing the PTG from the engine - check the engine MM. Similarly, cleaning the double check valve, as suggested by FH1100 Pilot is a simple task but it has to be removed from the engine.
My reference to the P3 filter was also incorrect, it should of course be the Pc filter.
Bell_Flyer and fokkerpilot : let us know the outcome of your troubleshooting so that we can all learn.