This wont help you but I had a DE Star Wars with full leds and flashers...The strobing effect was so blinding I swear it would cause a seizure. I think reg bulbs would solve problem and keep your guests eye sight in tact.

Yeah Mike, if you think that's bad, it is nothing compared to Baywatch. I learned my lesson

I have them in the light bar on the back of the playfield and they work ok and that's the only spot I used them. If you are using the flat ones the light projection is a strait line no side throw .I think they look worse than incandesents for dome covered flashers

Here is what I've gleaned from some other threads and confirmed with some very circuit wise guys that this will work. I personally never tried it and I'm selling the machine soon, but I'm confident it will work.

Cut off diode, d3,d4,d6, and d7 (just under the big tip36 transistors). Then add diodes to the solenoids 3a, 4a, 6a and 7a, White band on diode to power side on coils, usually yellow with purple stripe.

I just had a similar issue on my IJ. It turned out that one of the leads on a flasher socket was in contact with the lead on a general illumination socket and it was powering all of the flashers down the line. So maybe when you installed the LEDs, you shifted a flasher into contact with something it shouldn't. Your issue seems a little different, though. I'm not sure how the flippers would turn the flashers on.

What Matt said, had same issue with my Whirlwind.

Not true, but if you're happy that's all that matters.