Seen chains give up at anywhere between 30k and 60 k service or not . They must all have had one or more at some point
Chains , tensioners , guides , oil pipes to turbo on the S , Piston rings , are main faults
We've rebuilt these dreadful things many times , they can use oil like an oil tanker leaking and it doesn't show out the exhaust pipe , run that hot the bloody things burn it away .
Rust , interior , and the rest as you say are fine .