What was found
R PACK LIGHT FAULT. GROUNDED - YES. REMOVED AND REPLACED R/H AIR CYCLE MACHINE REF B737-900 AMM 21-51-04-400-802-002. COMPLETED UP TO 3.(I) AIR CYCLE MACHINE TEST. MEL MAINTENANCE PROCEDURE REVERSED FOR ACTIVATION OF THE PACK AIRFLOW SHUTOFF VAVLE, ONLY. D492 ELECTRICAL CONNECTOR INSTALLED. COMPLETED R/H ACM INSTALLATION TEST, LEAK & OPS CHECKED GOOD. MEL 21-1G CLEARED, ALL MAINT PROCEDURES REVERESED. SEMAC JOEY NOTIFIED. FWD CARGO HEAT DUCT VALVE OPENED AND SAFTIED. PLACARDS REMOVED.