As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN FOR HEAVY CHECK FOUND CORROSION ON FWD PAX DOOR CUTOUT LOWER MAIN SILL BEAM (L1)AT LOWER BEAM AREA OF BOTH ESCAPE SLIDE FITTINGS UNDER SERRATED PLATRES. MX CUT OUT LOWER MAIN SILL BEAM PN 170-03719-005 AND REPLACED IAW SRM 51-43-02. FOR DETAILS OF WORK PERFORMED SEE NRC # 2000-0046. AC RETURNED TO SERVICE.