Pull the carpet back and look for the probably corroded ground. It has tons of wires going to it. Wire brush..contact cleaner...whatever works.
As for the water leak. You'll want to clear that up at the same time. Which means finding it. That can be a good time. Off to look for the water leak thread.
It'* a long read and if you need the pics, maybe we can ask Jr'* to reconnect them or send them to us. But here'* a thread with basically every possible water leak mentioned and fixes listed.
Jr'* Water Leak Thread