Last fall I winterized my Aquacal heat pump, Model 120AHDEWNB, like they suggest. I pulled both input and output pipes, and the drain plug, and let the unit drain. When I went to restart the unit yesterday, I found the pcv elbow coming out of the heat exchanger was split. It didn't seem like a big deal, but it actually appears to be glued in to the heat exchanger. Can anyone suggest a vendor for parts, and a source for part diagrams? Thanks in advance!