What was found
DURING CRUISE, CREW REPORTED LOUD POP AUDIBLE FROM AFT PART OF FLIGHT DECK AND ODOR OF BURNT INSULATION PRESENT. SMELL DISSIPATED, THEN RETURNED OCCASIONALLY. CREW SUSPECTED POSSIBLE SOURCE OF SMELL WAS ACARS PRINTER. DIVERSION TO KAFW. LANDING WAS UNEVENTFUL WITH NO PRECAUTIONARY ACTIONS. ON ARRIVAL, AIRCRAFT GROUNDED FOR UNSCHEDULED MAINTENANCE. POST FLIGHT LINE MAINTENANCE CONFIRMED FAULT. ACARS PRINTER CIRCUIT BREAKER PULLED AND COLLARED. PRINTER CONNECTOR CAPPED AND STOWED. DEFERRAL MAINTENANCE ITEM-42016 MEL CAT C INITIATED. REMOVED AND REPLACED ACARS PRINTER IAW B767 AMM 23-22-03. ACARS CIRCUIT BREAKER RESET. OPERATIONAL CHECK GOOD. NO ADDITIONAL FAULTS NOTED. DEFERRAL MAINTENANCE ITEM-42016 CLEARED.