As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT ENG ANTI-ICE VALVE FAILING IN CLOSED POSITION. AFTER ENG RUN VALVE IN OPEN POSITION. DEACTIVATED RT ENG ANTI-ICE VALVE IN OPEN POSITION IAW MEL 3021D. SUSPECT ANTI-ICE VALVE IS STICKING. REPLACED EAI, OPERATIONS NORMAL. PROBLEM RECURRED ONE SEGMENT LATER. SUSPECT RT ENG ANTI-ICE CONTROLLER INOP. REPLACED RT ENG ANTI ICE CONTROLLER PER MM, NO HELP. REPLACED RT ENG ANTI-ICE VALVE AGAIN. OPS CK GOOD.