Look at the connections where you have rubber tubing to a hard line with a hose clamp on it. Loosen the clamp, re-seat the tubing and tighten it back up. I have had this same code along with the others, like I was telling you, but there wasn't actually anything at fault. I did this anyway but had no results until the air was dry. Hopefully it's nothing but otherwise you have good info to go on. Let us know what comes about