As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CAB ZONE TEMP LIGHT ILLUMINATES ON MASTER CAUTION RECALL. GROUNDED - YES. PERFORMED BITE TEST OF PACK TEMP CONTROL #1 & #2, NO FAULTS FOUND REF B737-900 FIM 21-60 TASK 843. PERFORMED BOTH PACKS OPS TEST NORMAL B737-900 AMM 21-00-00.