First time out today, My 2018 R21 is spraying water from bottom of heat exchanger. Throwing a check engine code on dash. Is there a way to change exchanger cap on bottom where water is shooting out. I pulled blue plug in December but I think it was too late. I was recovering from damage to my home from Helene and forgot. Indmar raptor 6.2 Liter. Has anyone done this before and any instructions or tips on best way to access and change bottom cap? Also where to find caps and what size?