I think that two of the paralleled diodes in the main 4-diode bridge rectifier have failed? If so, then in theory you could ignore the "inductor feedback circuit", take the two diodes from the small square top plate, and then use them to fix the main 4-diode rectifier.if i was clever i could use the suplus 2 diodes and use it as a 4 diode rectifier as some would say as it should be