What was found
LEFT PACK LIGHT ILLUMINATED ON CLIMB OUT THROUGH 18500. UNABLE TO RESET THE SECOND TIME. GROUNDED - YES. PERFORMED BITE CHECK OF L/H PACK ZONE TEMP CONTROLLER AND PERFORMED OPS CHK OF L/H PACK W/ NO FAULTS NOTED. REPLACED DISCHARGE O/H SWITCH PER B737-800 AMM 21-51-42, TURBINE INLET O/H SWITCH PER AMM 21-51-41, AND COMP DISCHARGE O/H SWITCH PER AMM 21-51-40, ALL OPS CHK NORMAL. ETOPS GND VERIFICATION SUCCESSFUL. A/C OK FOR SVC. SEAMC JEREMY NOTIFIED. NON ASA# TSAH74M.