Ok, let's break it down.
Did you check superheat?TXV seemed to be feeding.
You don't have a leak in the HX. Here's why:I suspect the heat exchanger has a leak in it but not sure, how can I verify?
This, of course, assumes that the suction line referred to is the suction from the subcooler. Since it would be leaking liquid directly into the suction line, a leaking or ruptured heat exchanger like that would cause a VERY cold suction line.Suction comming from med. temp. rack was hot and would never get cold after about an hour.
Now, to FIX this thing.
What type of subcooler? If it is one of those tube in tube types, stop right now and don't waste any more time. They just don't work.
If it's a brazed plate style HX, first, verify proper liquid to the unit, check the power element and see what you find.