What was found
ON CLIMBOUT RECEIVED EICAS MESSAGE MLG MONITOR DISPLAYED MLG UP & LOCKED. MLG HANDLE IN UP/OFF POSITION & LT HALF OF NLG INDICATOR GREEN. TURNED OFF PAX ENTERTAIN EQUIP, LIGHT REMAINED ILLUM. TURNED BACK & LANDED W/O EVENT. MX ERASED EICAS MESSAGE. MESSAGE DID NOT RETURN. NO IN-FLT FAULTS DETECTED ON PSEU, BITE CHECK SYSTEM 2, MLG DID HAVE 006 CARD FAULT, SYS 1 OK. R & R NLG DOWNLOCK SENSOR, NO HELP. R & R PSEU IAW BMM & SWUNG MLG SEVERAL TIMES, OPS CK GOOD. CONFIRMED FAILURE OF UNIT. PBC CARD 006 FAILED TEST FOR DRIVER 106 (L6GA), RESEATED BOARDS & FAULT CLEARED. CARD 007 ALSO FAILED, PERFORMED CONTINUITY TEST & FOUND HIGH RESISTANCE AT PINS J7-B11, J11-C40, J12-B9 C4, AND J13-A11 C39.