As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE MAINTENANCE CHECK, FOUND PILLOWING SKIN AT BS 727 BETWEEN S27R AND S17L. REMOVED FASTENERS FROM RBL 8 TO LBL 8. OPENED SKIN, FOUND SHIM CORRODED BEYOND LIMITS. FOUND MINOR SURFACE CORROSION ON SKIN AND CHORD. FABRICATED NEW SHIM, CLEANED AND TREATED SKIN AND CHORD. REINSTALLED SHIM AND FASTENERS WITH SEALANT.