**Fixed! It was a bad rottendog flipper board. The board had the wrong transistors on it. Honestly, this is ridiculous. This is a known issue from SEVEN years ago (https://pinside.com/pinball/forum/topic/rottendog-flp023-data-east-flipper-board-issue). My board has a manufacture date of 2018 and I received it last month. Replaced the board with an original DE board I got on eBay and all is good**
I had two great weeks with my JP after a prior flipper issue (https://pinside.com/pinball/forum/topic/de-jurassic-park-flippers-fire-amp-blow-fuses) and am now back in the flipper dog house.
The left flipper occasionally fires well but most of the time slowly moves its way up to the stop position. When the flipper fires correctly, I see the flipper LED light up on the flipper board. When the flipper slowly moves, the LED doesn't light up.
Originally, most of the time the game was fine and the problem would fix itself. Now it happens during every game.
I have taken a look at the DE pinball repair guide, but it doesn't mention the LED at all. Based on prior pinside threads, I cleaned the flipper button leaf switch contacts with a business card, but that hasn't fixed the issue.
Any help is greatly appreciated. thanks!