I’ve just started a S3 Lightweight restoration project after a few years doing other things, and am having trouble with some of my kit: The air wrench and air snips run as soon as I connect the compressor line: the trigger isn’t shutting the air off, whilst another air wrench and the cut off tool seem to have air leaks from joints in the body. They were all working fine when last used, but that must be 10 years ago, and they’ve just been in a tool chest in the garage since. Any suggestions please?

Seals and o rings dried out. Should be refurbable.

Search for air tool oil & get them lubed up.

Agreed, run dry, air-tool oil and new seals. And use tools, don't buy them and leave them 10 years, that's the real problem.