What was found
LE SLAT ASYM EICAS MSG DISPLAYED AT FL350 NO SLAT OR FLAP MOVEMENT NOTED PERFORMED BITE OF FSEU1(-40) & FSEU2(-40) PER FIM 27-51-00-815- 805. FOUND "SLAT LOSS" FAULT ON FSEU1, "SLAT ARM DISAGREE" FAULT ON FSEU2, AND NO FAULT ON FSEU3. UPON CHECKING L/E SLAT LOSS DETECTION CIRCUIT, FOUND 115VAC WAS BACK FEEDING TO FSEU1 PLUG D3258A PIN G9 & FSEU2 PLUG D3312A PIN G9. AFTER FURTHER INVESTIGATION, FOUND R ANTI-COLLISION LIGHT POWER TO BE THE SOURCE OF BACK FEED DUE TO FAULTY D41396J RECEPTACLE. WILL REQUIRE REPLACEMENT OF RECEPTACLE. ALL T/S DONE PER SSM 27-81-05 AND WDM 27-81-31.