As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAINS WINDSHIELD WIPER STUCK IN THE VERTICAL POSITION WILL NOT OPERATE. DUE TO WEATHER PROBLEMS AT DESTINATION AIRPORT AIRCRAFT RETURNED TO RDU. INSPECTED CAPTAINS SIDE WIPER MOTOR, CYCLED CIRCUIT BREAKER FOR WIPER MOTOR. PERFORMED OPERATIONAL CHECK OF WIPER MOTOR IAW B-737 AMM 30-42-31. OPERATIONAL CHECK GOOD.