Ryobi 754 ink keys and plate change problem

Hello everyone, I'm using a Ryobi 754 and I'm having 2 problems.
1. problem ink keys. I opened a topic about this before. Based on the ideas I got, I disassembled and cleaned the entire ink tank and ink switches. It turned out great, but even though the room motors are working, they are not working (I increased it by 20 points and it only returns 0.5 points). and the fault light is on, I would be grateful if you could help me with this.
2. Another problem is that I am having trouble installing and removing the plate. The piston cannot push the shaft which releases the plate and I have to help with my hand and sometimes have to remove it by hand.
I would be very happy and grateful if you could help me with these issues.