The front engine mags are easier to check than the rear engine, but often involves removing allot of stuff just to get to the mags...especially with a turbo version, so 3 hrs of labor seems like a real good deal to me. As for low RPM, also check that the propeller cable travel allows full contact with the prop governor high RPM stop -- if not, it is adjustable.
If the exhaust clamp screws were rusted...and it usually is...then it can take many more hours to remove the exhaust system. Also, Skymaster cylinders are not as easy to R&R as most general aviation planes...because of the baffling and cowling.
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