RCI 2990 old style onboard SWR tester wont calibrate

[euhara]

Radio Make and Model: RCI 2990 Old style
PCB Number: ept295013z
PLL Number: ????
Test gear available: DVM, Frequency counter
Symptoms: Onboard SWR test doesn't Reach set point

What is working: Everything else works

What has been tried: Turned RF power up fully and tried to set calibration, will not go to set point on meter.

Did it suddenly happen ?: Yes
Anything else that may be of help?: I don't know where to look for the fault

Any advice greatfully accepted.

Regards, Jim

[euhara]

I like to be ignored. Doesn't look like much is happening on this forum.

Thanks anyway,
Jim