What was found
(CAN) WHILE PERFORMING 100 HRS INSPECTION, POST OPENING INSPECTION OF OIL FILTER REVEALED ALUMINUM CHIPS IN FILTER. AFTER CONSULTING WITH APPROVED REPAIR SHOP, NR 2 & NR 4 CYLINDERS WERE REMOVED AND PISTON PIN ENDS WERE FOUND WITH METAL MISSING. CYLINDER WALLS INSPECTION REVEALED NO FAULTS. REMAINING CYLINDERS NR 1 & NR 4 WALLS WERE CHECKED WITH BOROSCOPE THROUGH SPARK PLUG HOLE AND REVEALED NO TRACES OF SCORING/SCRATCHING. NEW PINS WERE INSTALLED. GROUND RUN C/OUT AND ACFT RETURNED TO SERVICE.