My Baywatch display went blank on me, and I found that Stern/Sega actually had a service bulletin to fix the issue with an updated harness. I can't say for sure it will fix yours but it worked for me. My Batman Forever already had this installed when I bought it.
http://www.marcospecialties.com/pinball-parts/500-6326-00
http://arcarc.xmission.com/Pinball/Stern%20Service%20Bulletins/sb/sb106.pdf