As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN HEATER EXHAUST SKIN REPAIR CRACKS WERE FOUND ON THE CABIN HEATER EXHAUST STAINLESS STEEL DOUBLER SHIELD. STOP DRILL CRACKS WITH A 5/32 INCHES DRILL MINIMUM, MANUFACTURE DOUBLER FROM STAINLESS STEEL IAW DWG 1420-01 & DC 6 A & B OHM FIG 14 - 7 EO 1420.