As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHERE THE JANITROL CABIN HEATER MOUNTS TO THE FORWARD CABIN ENTRANCE BULKHEAD FS234.5, A 4 INCH CRACK WAS DISCOVERED DURING A 6 YEAR C-CHECK INSPECTION. THE CRACK RUNS PARALLEL TO THE HEATER MOUNTING FLANGE. THE 5 OTHER AIRCRAFT OF THE FLEET ARE TO BE INSPECTED BEFORE UPCOMING FIRE SEASON. FINDINGS WILL BE RECORDED.