What's up with these jet drive bearings. Both my units have 30 hours on them and I had to replace the jet drive housing unit on both. Bearings rusted out. I flush and rinse every use. I have a unit that started in the driveway got it to the water and just beeps. I hear a clicking on the starter solenoid. the other one works so I switched batteries and no go. I switched the solenoids and no go. Any ideas?