Galaxy II, low output-FIXED

[HubbenTo]

Radio Make and Model: Galaxy II
PCB Number: EPT360010A
PLL Number: MC145106P
Test gear available: Osc, FreqCount, Multimeter...
Symptoms:
If I only have Final TR43 plugged in, I have abt.8W output on AM.
If I plug in Final TR56 also, you can not adjust the output power more than 2-3w AM out. Should I be able to get output with only Final TR56, connected?

What is working:
Everything else.

What has been tried:
Checked the komponents around TR43 and TR56.

Did it suddenly happen ?:
Don't know.

Anything else that may be of help?:

[HubbenTo]

I mistype in my post, it's TR56, which has power output AM / FM / SSB.
It will be the left final (TR56) which has power, as seen from inside the circuit board.
Have I only right final TR43 plugged in, then I have no power at all.(It is OK in TR56 position.) So the both finals are OK.
The colectors got 7.9V in AM/FM, and 13.5V in SSB.

[HubbenTo]

I have checked on some components inside the radio now, thought the error was a bipolar electrolyte (C174/2.2uF), instead of an ordinary electrolyte, but it did not help so much.
Measure the voltage on the IC9 (SO42), negative 0.4 V on the legs 11 and 13 at the RX, 1.4 V for the TX. Do not know if there should be negative voltage at the RX. Will continue to check components on the PCB.

[HubbenTo]

Hello again...
The problem is solved.
It was C171(390pF), which was defect. Replaced from a "donor" radio.
Now I have 10W AM / FM and 20-25W SSB. Hope someone else will benefit from this too.