Have a 98 T-100 , have been using Sylvania Silverstar last few months, no problems, last few days have noticed low beams getting weaker, Then one morning NO low beams, but still have Hi's. Toyota dealership say did all tests, and that OEM they tried work fine. I replaced again with Siverstars and still NO lowbeams.. I need the brightness of the Silvers as i do alot of nite driving. what the heck is going on? Any thoughts?. Thanks in advance.