635 csi garaged for 5 years

An acquaintance inherited a 87 635 csi , less than 100 k, been garaged and not driven for 4 to 5 years. The car is pristine, the usual grime from the garage, a few door dings.Where would I get like a check list of things to go through to get it road worthy. I'm assuming the dealer or mechanic will want at least $1k-$2k US for the service. Thanks. It sure is one beautiful machine.