First thing I'd try is to put a pressure gauge on the
output and a vacuum gauge on the input.
Run the compressor and see if you can tell which side
has the problem. Might be interesting to energize the
reversing valve.
Hard to tell from the picture you posted, but a corner of
one of the
tabs on the reversing valve mounting bracket looks like it
might be pressing into one of the copper tubes.
I have an ultrasonic leak sniffer that listens for the high
pitch of a leak. Not sure if it will help on a low pressure leak.
Also have a couple of freon and hydrocarbon sniffers
that can find leaks.
I'm assuming that the dryer is the only place you could
contaminate with test gas, but not sure what's safe to use.
I think canned air is freon????
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