I was changing out bulbs in my DW. After I changed out a couple of burnt out bulbs in the coin door, I noticed the miniplayfield started malfuctioning. The playfield randomly stopped and the opto was randomly triggering. The outhold for the Tardis fires randomly, the ball kickers in the mini playfield started firing randomly. the 5 bank opto switches on the miniplayfield don't respond...pretty much every opto I've checked isn't responing. Not sure what caused it or how to fix it. Any advice would be helpful. Thanks