If not done recently, definitely water pump and tires. With the PPI have a check on AOS (crank case vacuum pressure with a manometer), window, door, and roof function, engine and transmission mount integrity, pulleys and drive belt. That's all stuff that will likely degrade with age regardless of miles.
Cost depends a lot on the shop. A good water pump is from $250 - $350 for the part. A recent forum post was talking about a shop charging over $1,000 for the total job. With a little experience it can be done in about an hour in the driveway with the rear wheels on ramps.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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