As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKE-OFF, THE CREW RECEIVED A "LG WOW SYS FAIL" EICAS MESSAGE. UPON CONSULTATION WITH FLIGHT DISPATCH AND MOC, THE FLIGHT RETURNED TO POINT OF DEPARTURE FOR MAINTENANCE ACTION. CARIED OUT NLG & MLG WOW SENSORS FUNCTIONAL TEST AS PER AMM 32-62-01 AND 32-62-03 NIL FAULT FOUND. REPLACED LDG GR CTL LVR AS PER AMM 32-33-01. LDG GEAR OPS TEST SERV.