What was found
FLT 3121 - ON CLIMB-OUT FROM MSP, THE RIGHT ELEVATOR HORN HEAT BECAME INOPERATIVE. THE AIRCRAFT RETURNED TO MSP. MAINTENANCE REPLACED THE RIGHT BRUSH BLOCK, P/N 782689-3, WHICH WAS FOUND TO BE WORN, AND THE CURRENT LIMITERS, P/N MS28937-30, WHICH WAS FOUND TO PRODUCE LOW VOLTAGE. ALL CHECKS SATISFACTORY. REFERENCE: OPERATOR CONTROL NR MALA965210.