I suspected a tub seal leak and after reviewing the "exploded" view drawings I suspected a leak near the drain sump. I watched the excellent repair videos and removed the sump which was started to disintegrate. Ordered parts on Friday night, received them on Tuesday. Replaced parts and checked for leaks. DON'T forget to reconnect the drain hose to the drain trap. Lol (I wasn't laughing at the time). Really easy job. Try to use exact tools if you have them. Will have nut drivers the next time.