I have a. Issue on my DE Star Wars machine where the right flipper sticks up for just a split second or two after holding the flipper button down. The flipper looks to be ok mechanically when I move it manually although seems to hold for the little bit longer than the left when energised even when just pressing the button quickly. I replace the diode as I had read this can cause an issue although this did not fix the issue.
Does anyone know where I should look next.

The spring seems fine. It only seems to happen after being energised. Being the Star Wars model there is no EOS switch so thought there may be something on the board I need to check.

Just replaced the buttons with some spares I had and cleaned the leaf switch just by running a business card through as to not damage the contacts. What I did notice was when I hold the left button down I get a buzzing noise from either in the cabinet or head box and when I hold the right button down I don't get the buzzing noise although the flipper holds for a split second longer than it should.
Should I hear a buzzing noise when the flipper is held or not and is there something else that may be causing the right flipper to hold slightly longer.

Tightened up the coil stop and the buzzing stopped. Think I will replace them with new ones. I also reseated the connections on the flipper board and tightened the flipper assembly which looks to have fixed the flipper getting stuck issue so think it is all ok now. Thanks for all your assistance.