What was found
(CAN) 3 MINS AFTER TAKEOFF PILOT REPORTED NAVIGATIONAL PROBLEMS AND RETURNED TO BLOCKS. NR 2 GEN FELL OFF LINE, THIS IS A RECURRING PROBLEM, NO 1 ADI TOPPLED. NR 1 VG REPLACED AND SERVICEABLE. NO 2 GEN PUT ON MEL THEM REPLACED, HED BEEN REPLACED TWO OTHER TIMES. NO 2 PILOT RELAY REPLACED.