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Thanks for fixing the link.

Doing a little research online I learned that copper electroplating occurs in a refrigeration system when acids are present. It makes sense because the job that I found copper plating on the piston...

[URL=http://www.amazon.com/Drill-Master-Titanium-Nitride-Numbered/dp/B006ZBBW00/ref=sr_1_10?s=hi&ie=UTF8&qid=1356719200&sr=1-10&keywords=numbered+drill+bits[/URL]

The drill bits are numbered drill...

I had a similar problem a few years back. Several techs before me tried everything and still could not correct the problem. I put my gauges on and immediately could see there was a restriction. Guys...