What was found
(CAN) AT THE END OF EXTENSIVE POST BLOCK CHECK GROUND RUNS; THE NR 2 ENG GEN FELL OFF LINE AND NR 1 TRU AND AC BUS FELL OFF LINE; TRIED TO POWER BACK AND RESET IT WAS NOTICED THAT THE AC GEN CAUTION LIGHT WAS NOT SHOWING. SO THE AIRCRAFT WAS SHUTDOWN AND AFTER SOME INVESTIGATION IT WAS FOUND THAT THE AC GEN CONTACTOR HC-AIN-022 HAD FAILED INTERNALLY MELTING THE RELAY AND ASSOCIATED WIRING. (TC NR 20070709002)