As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEATER NOT WORKING IN THE NORMAL OR EMERGENCY POSITIONS DURING START RUNUP. HEATER MIXER/SHUTOFF UNIT FAILED USING THE LUH-72 HEATER EJECTOR TEST SET AND TROUBLESHOOTING GUIDE IAW AMM 21-41-00, 1-1. REMOVED AND REPLACED HEATER EJECTOR ASSY.