One of my two MP 40 W's is apparently in a permanent red/green blinking stall mode. I tried switching wetsides with my other one and it didn't fix it, also tried tightening or loosening the nut after a vinegar bath. I did a hard restart as well (which took some time as the buttons on the controller are a bit hard to actuate). I bought both of them when the price dropped a couple years ago but thought they would last longer than this. Can't figure out if I need a new wetside, controller, or dry side. Any advice or help would be appreciated, I'd be happy to buy whichever piece has gone bad but can not isolate it to do that. I love these pumps but for the three hundred dollars or so I spent for each I expected them to last longer than typical power heads. Any advice on how to fix them would be appreciated.