What was found
LEFT PACK LIGHT COMES ON WITH MASTER CAUTION RESET RECALL. IT EXTINGUISHES WITH MC RESET. GROUNDED - YES. PERFORMED PZTC BITE IAW B737-800 FIM 21-62 TASK 801. #1 PZTC SHOWED RAM AIR ACT ON BIT, BUT CLEARED GREEN ON VERIFY. RAN BITE CHECK AGAIN AND LISTENED TO RAM AIR DOOR WHILE OPERATING, NO DEFECTS NOTICED. LH PACK LIGHT NO LONGER PRESENT ON MASTER RECALL. RAN LH AND RH PACKS TOGETHER AND INDEPENDENTLY IAW B737-800 AMM 21-00-00-800-803. FOR 5-10 MINS EACH, NO FAULTS. ALL OBSERVATIONS NORMAL AT COLD AND WARM SETTINGS.