rci2950 scratching sound in vol. on rx or pa.

[falcon505]

Radio Make and Model: rci2950
PCB Number:ept295013b
PLL Numbercx 7928b
Test gear available full bench

Symptoms: tx seem to be fine but no mod. no vol. on rx or pa. there is a loued scratch sound coming out of the sp. with the vol. up or down.

What is working:all els seems to be working

What has been tried:Changed q51,q53,and ic19

Did it suddenly happen ?: got it like this
Anything else that may be of help?:

[falcon505]

Got it working good rx and tx and the pa is now working but i stil have a lot of a scratching sound coming from the vol. weather the vol. is up or down.
Thanks mike