I think your flipper problem lies in a different area. I have a Data East Robocop with a weak right hand flipper. I have not pulled my MPU to address the problem so I can't say this 100% yet. But my reference material says if there are flipper problems then a transistor on the MPU might be the culprit.

http://mirror2.ipdb.org/files/2356/Data_East_1991_Star_Trek_English_Manual_with_schematics.pdf

In my short time of owning my Robocop, I consider the following link to be the DE repair bible. Somewhere in the pages is the reference to that little transistor

EDIT: Incorrect link was linked when I posted. Now Corrected.

http://techniek.flipperwinkel.nl/desega/index2.htm#flip0

Over on the right hand side of this diagram/schematic is a small transistor a little to the left of the flipper ground relay. What I am reading says to replace this transistor. As I said, I have not attempted to replace mine yet, so no guarantees.

On my MPU board I have painted the offending transistor with some orange paint.

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This is the schematic for the Star Wars flipper board. Part number 520-5033-00. Revision F. If this is the board you have then you need 3 amp fuses.

EDIT: My apologies. I said Star Wars instead of Star Trek. But both pins use the same flipper board. But I am confused about the 5amp fuses; Where in the manual did you see that? I can't find any reference to 5 amp fuses.

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In my first post to you I linked an incorrect manual. I have corrected that and will link it here, as well.

http://techniek.flipperwinkel.nl/desega/index2.htm#flip0

Section 3H talks about the solid state flippers and how they behave. And how they work with no EOS switch. Everything about the solid state flippers is in section 3h. If you have a flipper sticking in the up position it may be a bad diode.

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How did this post resolve? I can see the OP is still here posting.