It's been many years since I have been involved with 0-235s. However back then they just kept running until we got tired of wiping the oil off them. As I recall that was somewhere around 2100 -2200 hours. Official TBO is below those numbers.
This is Lycoming's TBO service instruction.
https://flymall.org/aircraft/docs/Ly...ul%20Times.pdf It appears that they have increased the recommended times since I was active with the 0-235. These times are not considered regulatory in the States for privately flown airplanes such as your use.
You could remove the rocker covers and check how much wobble the valves have in the guides. This will give you some clues as to how much wear and whether the engine should be torn down or not. Look inside the cylinders with a light for scoring on the cylinder walls. This will address broken rings.
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