What was found
(CAN) ON APPROACH, CREW NOTED A FAINT "ELECTRICAL" ODOR. ALL SYS WERE WORKING NORMALLY. AFTER ARRIVING AT THE GATE CREW NOTICED THE ACARS PRINTER FELT HOTTER THAN NORMAL. CREW PULLED COVER OFF AND FOUND THERMAL PRINTER PAPER WAS BLACK. C/B FOR PRINTER PULLED AND COLLARED, UNIT COOLED DOWN TO ROOM TEMP. ACFT RELEASE UNDER MEL 23-15-2 AND RETURN TO SERVICE. ACFT OVERNIGHT, THAT NIGHT AND ACARS PRINTER WAS REPLACED AND TEST SERVICEABLE.