Quoted from desertT1:the other two bumpers and the rest of the upper section are not.
These could very well be on the same GI string- check your manual and check the fuse that this is on, may be blown.
Quoted from desertT1:the GI that does work do a sort of 100%/75%/100%/75%/100%/75% sort of pulsing.
Probably just the nature of the LEDs during dimming operations. Hergs GI OCD Board would eliminate this and make them act just like incandescents