As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT C-CHECK, CORROSION WAS FOUND ON UPPER WALL OF RAM AIR PLENUM CHAMBER OVER PRIMARY HEAT EXCHANGER. REMOVED HEAT EXCHANGER FOR ACCESS, REMOVED EXISTING DOUBLER, INSTALLED REPAIR PER ENGINEERING ORDER PMSI-135D-1. INSTALLED DOUBLER 15 BY 3.75, DOUBLER 19.5 BY 6.5, TRIPLER 24 BY 6.5 . INSTALLED FIBERGLASS REPAIR PER SRM 51-40-8 ON RAM AIR DUCT. INSTALLED L-ANGLE PER SRM 51-20-4.