What was found
RIGHT TRANSFER BUS OFF LIGHT ILLUMINATED TWICE IN FLIGHT, ACCOMPANIED BY M/C LIGHT. ILLIMUNATION WAS A HALF SECOND BOTH TIMES, NOT ACCOMPANIED BY ANY OTHER INSTRUMENT INDICATION. FIRST TIME WAS AT CRUISE. SECOND TIME WAS DURING DESCENT. GROUNDED - YES. REMOVED AND REPLACED #2 IDG PER B737-800 AMM 24-11-11/401. PERFORMED OPERATIONAL CK PER AMM TASK 24-11-00-700-803. POWER LEAK CHECK COMPLETED PER AMM TASK 71-00-00-700-823-F00, NO LEAKS FOUND. PERFORMED IDG UNSCHEDULE REMOVAL FOR CAUSE INSPECTION REF AMM 24-11-11-080-801, NO FILTER CONTAMINATION FOUND. A/C OK FOR SERVICE.