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Roof should be grey on both power cars:

Is it just an effect of the photo, or is the 'dot' above the 'i' in 'Network Rail' on the side of the model circular instead of square?

I had dim lighting on one end of one of my Dapol 68s. I opened it up to investigate and found that the light guide had come adrift at the dim end - it wasn't as snug a fit as at the other end and needed some assistance to remain in place. Depending on where the LED is mounted (I can't remember now!) you might have a similar problem.