I have not posted on this in a while. I do have some resolutions and some still unresolved issues. The tank was not the issue, thank you God. The low pressure in the shower heads was hard water build up solved with CLR. The sink was a kinked hose. Released the twist in the sink hose and restored the sink pressure. I removed the sending unit from the suspected leaking tank and viewed in the tank. It was full and not leaking. There was a stream of water trickling from under the tank. Moving on to suspect plumbing lines. Eventually will solve the leaking fitting or hose.