What was found
FLT 6706 - BOS-CMH - REPORTED AN APU OIL PRESSURE CAUTION IN FLIGHT WITH THE APU SHUTTING ITSELF DOWN, ALSO REPORTED SMOKE IN THE CABIN. AFTER AN UNEVENTFUL LANDING MAINTENANCE CALLED. MAINTENANCE INSPECTED AND FOUND OIL IN THE PACK (AIR COND) SYSTEM. MAINTENANCE CLEANED UP THE OIL AND THE DISCREPANCY WAS DEFERRED. THE AIRCRAFT WAS RETURNED TO SERVICE. MAINTENANCE REMOVED AND REPLACED THE APU. OPS CHECKS GOOD. (M)