What was found
FLT CREW REPORTED NO RETURN ON RADAR, COLORS ARE ERRATIC. NO HELP WITH CHANGE OF TILT FUNCTIONS. RDR TEST NORMAL COLOR SCREEN. DEFERRED PER SAMC. FLT CREW COMPLIED WITH MEL 3443D. REPLACED WX TRANSCEIVER, TESTED OK. OPERATED WITH NORMAL RETURNS AND COLOR. REPLACED WX RADAR XCVR DUE TO OVERHEATED CONDITION UPON ARVL LAX, COOLING FAN AT FAULT. MR43527-89 OFF, MR43527-297 ON. FOUND COOLING FAN INSTALLED WITH LEADS SHORTED OUT TO GROUND. THIS FRIED THE NEWLY INSTALLED TRANSCEIVER. INSTALLED NEW FAN AND OLD TRANSCEIVER MR43527-89. TESTED GOOD PER MM.