As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MASTER CAUTION RECALL, MASTER CAUTION AIR COND LIGHT AND CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED, EXTINGUISHED DURING MASTER CAUTION RESET. ACFT GROUNDED. R & R LT PACK TEMP CONTROL MODULATING VALVE IAW AMM 21-51-10, OPS CHECK NORMAL.