What was found
L PACK LIGHT ILLUMINATED ON CLIMB TO CRUISE ALTITUDE RAN QRH TRIP RESET DID NOT EXTINGUISH PACK LIGHT AFFECTED L PACK SWITCH WAS TURNED OFF FOR DURATION OF FLIGHT PER QRH PROCEDURES. GROUNDED - YES. ACCOMPLISHED PZTC BITE PER B737-900 FIM TASK 21-62-801. NO FAULTS FOUND. DURING PZTC BITE OBSERVED LH RAM AIR INLET DEFLECTOR DOOR DOES NOT RETRACT. VERIFIED DOOR DEFLECTOR DOES NOT RETRACT TO "FLIGHT OPEN" POSITION. UPON FURTHER INVESTIGATION OF THE L/H RAM AIR INLET DEFLECTOR FOUND DOOR AND ACTUATOR LINKAGES TO BE DIRTY AND IN NEED OF LUBRICATION. DISASSEMBLED L/H RAM AIR DOOR ACTUATOR LINKAGES, CLEANED AND LUBRICATED THEM AND REASSEMBLED LINKAGE REF B737-900 AMM 21-51-22-400-802. NO LINKAGE ADJUSMENT REQUIRED PER AMM 21-51-22-400-802.