FREE FIX - FINE NOSED long pointy pliers, take the rear light clusters apart, one at a time. UNPLUG the electrical connector. Use long-nosed pliers to grip head-on the EARTH connector PRONG it might be the third one down, from memory, trace the one that goes to metal track common to ALL the bulbs. TWIST THIS PRONG by just a fraction. You can WD40 it and re-assemble. Do both to be sure, but boy, have some people spent money on new light clusters - my spouse's mechanic waxed on about what a good deal he got her on a second-hand light cluster - GREAT BUT YOU DON'T NEED IT, THE CURE IS FREE. TWIST THE PRONG WITH FINE-NOSED PLIERS A FRACTION, WD40 AND RE-CONNECT. DONE, FREE!