As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK LIGHT ILLUMINATED ON MASTER CAUTION RECALL, LIGHT EXTINGUISHED ON MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED LEFT PACK/ZONE TEMPERATURE CONTROLLER BITE TEST, REF 21-61-00-700-806-002. NO ACTIVE FAULTS FOUND. PERFORMED LEFT PACK CABIN TEMPERATURE CONTROL AND INDICATION - OPERATIONAL TEST REF B737-900 AMM 21-61-00-700-807-002 . SYS CHKS NML.