What was found
NR 2 ENGINE GENERATOR SOURCE OFF AND GENERATOR OFF LIGHT ILLUMINATED INFLIGHT, COULD NOT RE-ESTABLISH GENERATOR. WAS ABLE TO COVER BUSS WITH APU. GROUNDED - YES. RELAMPED GEN OFF BUS LIGHT AND DRIVE LIGHT. RECONNECTED #2 IDG AND RAN THE NR 2 ENGINE. IDG FAILED TO CONNECT AND SUPPLY POWER. VERIFIED RED IDG FAIL LIGHT ON NR 2 GCU. REMOVED AND REPLACED THE NR 2 IDG WITH NEW IAW AMM 24-11-11. PERFORMED IDG OPS TEST, IAW AMM 24-11-00-700-803, OPS CHECKED OK.