I got another question. I'm asking for my friend who owns one 1300. His turbine start and run perfect. Is after cool down whe he is going to start it again he notice that the shaft is stuck and don't move freely. He have to move the compressor wheel by hand to losse the movement of the shaft to be freely. Then the turbine continue to run perfect. What could be causing the shaft to stuck after cool down?

Thanks
Alejandro