What was found
FLT # 6182, RIC-BOS (AIR TURN BACK TO RIC). LG WOW FAIL EICAS APPEARED AFTER AFTER LANDING GEAR SELECTED UP DISAPPEARED AFTER LANDING GEAR SELECTED DOWN. QRH COMPLIED WITH; PERFORM NLG STRUT SERVICING AS PER AMM 12-12-09-600-801A NO FURTHER DEFECT NOTED.NO PRESENT FAULTS ON EICAS INTERROGATED CMC NOTED FAULTS 'NLG WOFW 1&2' & 'SENSOR TARGET DISAGREE' . INSPECTED TARGETS / SENSORS ON NLG WITH NO DEFECT NOTED. ACCOMPLISHED FULL NLG STRUT RE-SERVICE PER AMM 12-12-09-600-801A ALL CHECKED GOOD OK TO CONTINUE IN SVC