As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TOTAL AIR TEMPERATURE PROBE HEAT INOPERATIVE DURING INITIAL CLIMB. ACFT RETURNED TO STATION. MX ISOLATED THE PROBLEM TO THE LT ENGINE 50 PERCENT RELAY K644. R & R RELAY K644 IAW WD 30-33-11. SYS CHECKED GOOD IAW AMM 30-33-00 AND DURING ENGINE RUN IAW ERH 02.01.18.