As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1260 IAD-BOS, AIR RETURN TO IAD DUE TO THE LG WOW SYSTEM FAIL EICAS MESSAGE ILLUMINATED ON CLIMBOUT WHILE GEAR WAS RETRACTING. PERFORMED FIM TASK 32-61-00-810-890-A SERVICED NLG STRUT REF AMM 12-12-09. PERFORMED FUNCTIONAL TEST OF WOW SENSORS IAW AMM 32-62-01. PERFORMED FUNCTIONAL CHECK OF L/G SYSTEM EXTEND/RETRACT SYSTEM IAW AMM 32-33-00-720. OPS CHECK OK.