What was found
DURING HEAVY CHECK, LT WING BLACK SUBSTANCE ON 2 FUEL LINE GAMMA COUPLING CONNECTIONS UNDER PANEL 521AB. MX R & R LT WING 2 FUEL LINE GAMMA COUPLING CONNECTIONS UNDER PANEL 521AB IAW AMM 20-10-13. PN 170-088-07-401, TUBE ASSY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING HEAVY CHECK, LT WING BLACK SUBSTANCE ON 2 FUEL LINE GAMMA COUPLING CONNECTIONS UNDER PANEL 521AB. MX R & R LT WING 2 FUEL LINE GAMMA COUPLING CONNECTIONS UNDER PANEL 521AB IAW AMM 20-10-13. PN 170-088-07-401, TUBE ASSY.