I have a question for an experienced Catalina 350 owner. I recently checked my Rule 800 bilge pump with Blue-a-matic switch contained within the shower drain. I found mildew buildup, so I decided to clean and maintain the same. Upon completion, the drain hose that pumps into a U-line became clogged. I attempted to pressurize the line, and the line kept backing up, overflowing my drain tank. passing into my bilge holding tank. The outhaul valve began leaking water. I am lost asto how to repair the drain line? Would appreciate any help, before calling for professional help. Thank you