CMU200 problem after 836 MHz RX filter replacement

[APKVblog]

Hi
So, this time, after many years of resolving other people problems i have a my own problem
I did RX board 836 MHz filter replacement. All looked ok.But, whent it comes to tests and measurement it shows up that i must have screwd something. As you can see oh pictures i attached something happend and all levels are ca. 6dB less then it should be.
Unit passes all test except RX/TX board.
Due to lack of schematic it is hard to find what could cause this problem. It is obviously not a filter problem. Before filter replacement only 1200-2200 MHz band had low level and not passed LOOP test. Now it is low for all range.
TX and wideband PowerMeter seem to work properly.
Any ideas where to start looking?? Anyone has similar problem?
Any advice will be appreciated.

[snickers]

Try to reinstall software. Same or higher version.
After intalling process VERM will autatically start recalculation of callibration tables and store them to EEPROM.
I'm not sure it will help ... byt try.

[APKVblog]

I know that. But it gave no result in this situation.