What was found
ON PUSH BACK RT PACK LT ILLUMINATED, WOULD NOT RESET WITH MASTER CAUTION OR TRIP BUTTON. GROUNDED-YES. INSPECTED RT PACK EXHAUST PLENUM FAN BYPASS CHECK VALVE, NO DEFECTS NOTED. FOUND ACM BLADES BROKEN AND SHAFT SEIZED, REPLACED THE ACM. LEAK AND OPERATIONS CHECK GOOD, REF B737-900 AMM 21-51-04/401. DUE TO ACM RAM AIR IMPELLER FAN BLADES BROKEN, PRECAUTIONARILY REPLACED THE RT PACK EXIT SRADA. OPERATION CHECK GOOD, REF AMM 21-51-27/401. A/C RELEASED FROM MEL 21-1G, CONFIG CHANGES REVERSED (RT PACK VALVE REACTIVATED, CARGO HEAT DUCT OPENED AND SWITCHES RETURNED TO NORMAL POSITIONS). REMOVED PLACARDS AND C/N 13028486. SEAMC FELIX CONTACTED.