As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIMARY HEAT EXCHANGER IS DAMAGED AT INTAKE DUCT, HAS DENT POSSIBLE CRACK. THE COOLING FINS HAVE HEAT DAMAGE & EXFOLIATION. SOME FINS APPEAR TO BE WELDED TOGETHER. ACCOMPLISHED REMOVAL OF PRIMARY AND SECONDARY HEAT EXCHANGER PER MM. REPLACED PRI & SEC HEAT XCH PER AMM DUE TO CRACKED HEAT XCHG. RAN RT PACK, OPS CHK NORMAL