On our 2010 MKx, the full-width light bar on the rear hatch has started with 2 of the LED's that light it flickering, and often going off. This leaves the light bar only partially lit. Has anyone removed the light bar and looked into replacing the LED's that light it?... I'm sure Lincoln recommends replacing the entire unit (that was the recommendaton on my Mark VIII years ago)... but I'd like to avoid doing that, if I can just replace the individual LED's. Any experience on this?