As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPLACED HORIZONTAL STAB HEAT CONTROLLER. AFTER CHANGING CONTROLLER AIRCRAFT STILL HAD FAULT IN SYSTEM. T/S FURTHER DETERMINED REPAIRED CONTROLLER WAS NO GOOD. CONTROLLER SHOWED A FAULT IN T8. INSTALLED ANOTHER CONTROLLER SYSTEM CHECKED GOOD. (K)