As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: UPON REMOVAL OF SHEAR FITTINGS ON UPPER CENTER WINGBOX BETWEEN BS 540 AND BS 550, HAS VAPOR BARRIER DISBONDED. APPLIED PRIMER AND VAPOR BARRIER ON UPPER CENTER WING BOX BETWEEN BS 540 AND BS 550, MTERIAL THICKNESS WITHIN LIMITS. PER B737-NG AMM 28-11-00-300-804.