As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE APPEARED IN THE COCKPIT AND CABIN. MADE AN UNSCHEDULED LANDING AT BNA. REPLACED THE WATER COALESCER FILTERS AND ACCOMPLISHED A PACK BURN OUT TO REMOVE TRACES OF THE SMOKE. DETERMINED THE PROBLEM TO BE IN THE RT AIR CONDITIONING SYSTEM. CORRECTION TO THE SYSTEM WAS DEFERRED PER MEL. CHECK-C 10-28-99 STL.