What was found
FLT CREW REPORTS DURING TAXI "DRIVE" LIGHT CAME ON FOR APPROX 1 MIN, WENT OUT, THEN BACK ON FOR APPROX 3 MIN, WENT OUT, THEN BACK ON FOR APPROX 5 MIN, ON #2 IDG. GROUNDED - YES. PERFORMED IDLE RUN OF ENG #2. #2 GEN OPERATED AS NORMAL DRIVE LIGHT REMAINED EXTINGUISHED. OIL QUANTITY AT FULL. PER B737-900 FIM TASK 24-11-00-810-802 PERFORMED BITE ON GCU 2. GCU 2 SHOWS IDG FAULT LIGHT. #2 IDG IS DISCONNECTED. REMOVED AND REPLACED #2 IDG, REF B737-900 AMM 24-11-11/401, NO OIL CONTAMINATION FOUND. ACCOMPLISHED TEST AMM 24-11-11-700-803 AND NO DEFECTS NOTED. GEN 2 DISCONNECT SWITCH GUARDED AND SAFETIED.