Got an almost midtime io 540 in annual now. Good compressions. Good oil. Nothing in oil filter. But then they took the screen out and had an almost dime size chunk of aluminum off the accessory housing near the magneto gear boss I believe. Not sure how or why it happened, but it happened. Looking at the broken piece it appears to have had some slight discoloration like it was cracked for some time before letting loose, not like something else impacted it. They don't think they need to pull the motor to take the case out to get repaired, but they also said if an overhaul was a consideration now is the time. Why would it be a consideration since everything else is good?My attempts to post pics have failed miserably. Appreciate someone else's perspective!