Yong Heng rebuild kit

Hmmmm... Sounds like a good idea. This is actually the first time I've ever looked into repairing it... I actually ordered a CS4 but wanted to have the Yong Hing as a backup. I guess the question I should have posed was what everyone thinks is wrong with it. I believe I could just replace all of these seals that came with the machine to see if that works...
 
I actually did try tightening down the fittings to no avail. Where exactly is the dowty seal?
Right at the top of High Pressure cylinder where metal tubing connects.
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