What was found
APU TORQUE BOX TOP BULB FRAME STRINGER CORRODED. REMOVED DAMAGED FRAME STRINGER, LOCATED DRILLED AND INSTALLED A REPLACEMENT STRINGER IAW B737 400 SRM 51 40 02.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
APU TORQUE BOX TOP BULB FRAME STRINGER CORRODED. REMOVED DAMAGED FRAME STRINGER, LOCATED DRILLED AND INSTALLED A REPLACEMENT STRINGER IAW B737 400 SRM 51 40 02.