[Elecraft] K2 low audio please help

[Koppendorfer Klaus]

ich have a k2 with low audio - just when the AF pot is full cw i can listen to signals
sidetonelevel with 60 is ok,
AGC voltage at pin 1 U1 ist ok
the mute q6 and q7 are ok - testet to short source and drain on both - no louder audio

does anyone have reference voltages for product det. and if-amp
have an tek oscilloskope - so can measure af-hf voltages

tnx
klaus
oe6kyg