As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LEVEL OFF, HAD NO FWD CABIN TEMP CONTROL. RECEIVED A CABIN TEMP ICAS. TROUBLESHOT IAW MOCC. RETURNED TO DEPARTURE. SYSTEM CONFIGURATION OF CH 21 CTC SHOWED MISSING INFO FOR LT CTC CHANNELS 1 & 2. R & R THE LT CTC IAW AMM 21-61-01. CHECKED GOOD. OK FOR SERVICE.