I'm going to guess your issue is related too coolant...
Your "leak" in the coolant tank is actually the coolant overflowing when it overflows it drips on your PS connection causing intermittent issues. Your coolant is overflowing due to a blockage in the system, this blockage is most likely stopping coolant from getting to needed areas around your water jacket causing hot spots in the housing which ultimately lead to your engine dying.
Also I highly recommend you have a guy named Rotary Resurrection, or a company named mazmart rebuild your engine, they will give you a fair price and do a fantastic job. Contrary to popular belief the Rotary engine is not a simple 3 moving part machine that is held together by snake oil and baby seal grease.
If you decide to rebuild yourself have fun, but I'll be looking forward to my "I told ya so" moment.