As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN ZONE TEMP ILLUMINATED ON MASTER CAUTION RECALL. EXTINGUISHES WHEN RESET. PERFORMED PACK/ZONE TEMP CONTROLLED BIT TEST & OPS CHECK GOOD IAW B737NG AMM 21 51 00 700 803. RAN ENGINES AND OPERATED PACKS SHUT DOWN ENGINES AND PERFORMED PACK/ZONE TEMP CONTROLLER BIT TEST OPS CHECKS GOOD IAW B737NG AMM 21 51 00 700 803.