What was found
RT AC BUSS OFF, FIGHT CREW REPORTED BUSS DROPPED OFF, CABIN WENT DARK AT TIME OF FAILURE AND DID WAS NOT PICKED UP. T/S IAW WDM 71-51-22-1 AND SSM 24-23-02 . CHECKED WIRING FROM RT ENG GCU D2070B TO RT ENG IDG D1396P. ALL WIRING CHECKED GOOD. CHECKED RT ENG IDG CT CIRCUIT & FOUND AN OPEN ON PIN 13 TO 3. WILL REQUIRE IDG REPLACEMENT. REMOVED & REPLACED NR 2 ENGINE IDG IAW 24-11-01. PLACED FULL A/C LOAD ONTO #2 IDG WHILE RUNNING WITH LOAD BEING APPROX 0.70 WITH NO DEFECT NOTED TO RIGHT A/C BUS OFF OR LOAD SHEDDING ISSUES. OPS AND LEAK CHECK GOOD. REF L/PS 8010638, 8010648, 8010671, 8001666 FOR ALL WORK RELATED TO WIRINGS AND CONNECTOR. NO BPCU FAULTS NOTED. IDT ACP'D FOR INSTALLATION OF NR 2 IDG IAW REQUIREMENTS OF GMM 09-10-15.