As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE, THE ACARS PRINTER JAMMED. WHEN THE PRINTER WAS OPENED TO CLEAR THE JAM, A PIN FELL OFF THE ROLLER AND FELL INTO THE BOTTOM OF THE PRINTER. ONCE THAT HAPPENED SMOKE STARTED COMING OUT. (FLT 5169) REPLACED THE ACARS PRINTER. P/N: 497126-2 S/N OFF: 44292079