As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ENG START APU COULD ONLY GET N2 TO 22 PERCENT ON BOTH ENG'S. STARTED APU & TURNED APU AIR ON & HEARD LOUD HISSING NOISE FROM LT WING FOUND LT WING ANTI ICE VLV STUCK OPEN WITH NO INDICATION OF VLV OPEN. REPLACED LT WING ANTI ICE VLV REF MM 30 11 11, OPS CHECK GOOD.