The bulbs in the 3SX corners are shit. Bring them to a parts store to match up with some new ones that are at least worth a squirt a piss.

Sorry, I had nothing but problems with the cheap shitty bulbs 3sx uses and your thread struck a touchy chord with me. There was solder on both of the bulbs that was shorting them out for me. I got some orange bulbs at the parts store and have not had a problem since.