What was found
AIRCRAFT ARRIVED WITH CAPTAIN REPORT WHEN AIRFOIL ANTI-ICE IS IN USE, THE AIRFOIL PRESS ABNORMAL LIGHTS TURNED ON, THE TIME PRESS INDICATION SHOWS 60 PSI, THE LAND R ICE PROTECT TEMP LOW LIGHTS TURNED ON AND LT AND RT AIR COND TEMP HIGH LIGHTS TURNED ON. ANTI-ICE REGULATOR VALVE WAS REPLACED NOT CORRECTING THE FAILURE, SO THE ELECTRICAL CIRCUIT WAS CHECKED IAW WDM 30-11-01, DETECTING THE SWITCH S1-293 FAILED. IT WAS REPLACED IAW MM 30-10-11, TESTED CORRECT. DURING OVERNIGHT SERVICE WERE PERFORMED TESTS IN MODE 2 IAW MM 36-10-00, BEING ALL CORRECT.