Before two days everything was fine.
Yesterday,Knocker coil got weak.
Today Right Eject coil got weak.
All other coils work normal.
The boards are fine,because changed them with working one and same thing.
Coils are fine too.
So it left wire connection or connector.
Any suggestions what to try?

As I wrote it's not power board,because I changed it with another one and still the same.Reseat several times the connectors with no luck.

I will check all flashers,may be there will be the problem.
It's not wire because I checked the resistance of both coils directly on theyr connectors on the power driver board and it's OK.
The last think that I done was to put led on the rings.I will check under playfields.

Chcked all fuses-ok.
Flipper coils working perfect.
Same with other Power Board.

Stupid problem and wasted time.
Just clean very well the whole assy and now is OK.
Knocker had broken plunger.