As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6407 BNA-BOS, CREW DECLARED EMERGENCY AND AIR RETURN TO BNA DUE TO L/G WOW SYS FAIL AND L/G WOULD NOT RETRACT. TROUBLESHOT WOW SYS, NO DISCREPANCIES FOUND. INSPECTED AND FOUND HIGH PRESSURE FITTING LEAKING. REMOVED AND REPLACED FITTING ASSY. SERVICED NOSE LANDING GEAR IAW 12-12-09. ACCOMPLISHED OPERATIONAL CHECK IAW AMM 32-33-00.