What was found
FLIGHT 7584, AIR TURN BACK, WO 156151 & DISCREPANCY. DURING CRUISE, THE RT PROPELLER ANTI-ICE FAULT LIGHT ILLUMINATED. DUE TO EN ROUTE ICING CONDITIONS, THE DECISION WAS MADE TO RETURN, NO EMER WAS DECLARED. ACFT LANDED WITHOUT INCIDENT. REPLACED THE RT NR 4 PROP DE-ICE LEAD. OPERATIONS CHECKED GOOD. ACFT RETURNED TO SERVICE.