What was found
JUST AFTER TOC A/P A DISCONNECTED. CAPTAIN HAPPENED TO OBSERVE A BRIEF FLICKER OF THE SOURCE OFF LIGHT ILLUMINATED FOR GENERATOR 2. MASTER CAUTION DID NOT ILLUMINATE. RECALL WAS CLEAR. RE-ENGAGED A/P A AND CONTINUED WITH OUT INCIDENT. ACFT GROUNDED. ACCOMPLISHED FIM TASK SOURCE OFF LIGHT ILLUMINATION REF FIM 24-21, TASK 823. NO FAULTS NOTED. SYSTEM OPS CHECKS NORMAL. AUTOPILOT DISENGAGED DUE TO GEN 2 SOURCE LIGHT. FIM REPORTS INTERMITTENT FAULT. GROUND VERIFICATION SUCCESSFUL. VERIFIED IDG SERVICED CORRECTLY IAW AMM 12-13-21.