What was found
DURING HEAVY CHECK, LT WING, NR 4 SPOILER PCU TOP BOLT IS CORRODED. MAINTENANCE R & R LT WING NR 4 SPOILER PCU TOP BOLT IAW AMM 27-65-01, PN NAS6212-31D.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING HEAVY CHECK, LT WING, NR 4 SPOILER PCU TOP BOLT IS CORRODED. MAINTENANCE R & R LT WING NR 4 SPOILER PCU TOP BOLT IAW AMM 27-65-01, PN NAS6212-31D.