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The lower pan seal is a very simple repair - drain oil, remove the 13 bolts holding the pan on, clean the mating surfaces on the pan and the block, re-seal with silicone, replace pan and re-fill with oil - It doesn't use a gasket at all, just a silicone bead, which is why it's prone to 'bleeding'.
The chain tensioner and valve bolts again is a pretty easy fix, but more difficult due to access.
You can have 100 Inspections done... but it all boils down to one thing - believing what someone else tells you, especially if you can't/don't inspect it yourself and know what you're seeing when you're looking at it.
If the mechanic is confident, and you're confident in him... and the car otherwise looks to have been well-maintained and in good condition, then you have to trust your gut.
Every used car involves some risk. A PPI minimizes that risk, but won't eliminate it altogether.
If everything 'feels' right and the car is priced competitively, then go with your intuition. good luck!
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