I think after 4 1/2 years hes either sorted it or moved it on.
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There is no LR part number. You’ll need to confirm the brand of compressor then go for a google. It’s likely a Sanden, but get the details to confirm. I got mine from the US.
Don’t waste your time though. Just change the compressor.
Yes im going to replace my compressor, but there are LR numbers in that document