Forgot to say about the cat - if you crawl under and tap the cat with your fingers, if it sounds hollow then it almost certainly is. If so, almost certainly the cause of your rasp.
Surface rust underneath is easily dealt with, wire brush to get rid of the loose stuff then your choice of underbody rust killer/preventer/seal. It's a dirty and messy job but once it's done, you won't need to re-do it for a while.
What evidence have Wrights provided that it's the pump/compressor?
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........
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