What was found
FLT 610 - CUN-MEX - FLIGHT RETURNED, 'AIR FOIL ICE PROTECT' OUT OF SERVICE AT 31,000 FEET WITH ICING CONDITIONS. DURING REVISION THE WINGS AND TAIL ANTI-ICE VALVES WERE TESTED AND RELAY R2-189 WAS ADJUSTED. DURING OVERNIGHT SERVICE THE H3766020 AND 2H378C20 ELECTRIC LINES WERE CHECKED AND RELAY R5-1203 WAS FOUND WITH PINS DAMAGED. IT WAS REPAIRED IAW WDM 30-11-01 AND ANTI-ICE VALVES WERE REPLACED IAW MM 30-10-02 AND 30-10-03, TEST CORRECT IAW MM 36-10-00. (M)