As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 508 - 'THE WING ANTI-ICE CAPACITY' MESSAGE CAME ON WITH THE WING AN TAIL ANTI-ICE TURNED ON. ACFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RT HPSOV NOT OPENING COMPLETELY WHEN AIR IS ON. REPLACED THE RT HPSOV. OPERATION CHECKS NORMAL. (W)