I have a travel trailer with Norcold N512 installed. It was working fine but I haven’t used it this summer. It was left winterized but I went in to re-winterize and noticed brown liquid coming out and made paddle on the floor. Can it be repaired or would it be more of a sound decision to have it replaced? What could be the cause of it? I tried to turn N512 on and it did but doesn’t seems to be chilling at all. Thank you!