What was found
DURING CRUISE THE PACK LIGHT ILLUMINATED. RAN QRH AND LIGHT WOULD NOT STAY EXTINGUISHED. PACK TURNED OFF PER QRH FOR REMAINDER OF FLIGHT. GROUNDED - YES. REF B737-900 FIM 21-53 TASK 820, COMPLETED STEPS A THRU E AND F (1&2). DURING RAM AIR SYSTEM-OPERATIONAL TEST, EXIT SRADA WAS HUNTING PRIOR TO SETTLING IN THE FLIGHT POSITION. REPLACED THE EXIT SRADA, OPS CHECK GOOD, REF B737-900 AMM 21-51-27/401. A/C RELEASED FROM MEL 21-1G, CONFIG CHANGES REVERSED REF B737-900 AMM 21-00-00-440-801.