As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2636 - EWR - FLIGHT CREW REPORTED THAT INFLIGHT AIRCRAFT FAILED THE ICE PROTECTION TEST PART B - ONLY GOT 3 OPEN ; WING ANTI-ICE DID NOT OPEN. CREW ATTEMPTED THE TEST SEVERAL TIMES AND FAILED. ALSO UPON ENTERING ICING GOT A WING ANTI-ICE FAILURE ON. CREW PERFORMED AIR RETURN AND LANDED UNEVENTFULLY. EWR MX REMOVED AND REPLACED WING ANTI-ICE VALVE NR 1 AND PERFORMED OPERATIONAL CHECK SUCCESSFULLY. ACFT WAS APPROVED TO RETURN TO SERVICE.