The powercars have, for those unaware as to why the yellow ends have gone, been fitted with a new top headlight in addition to the original clusters.
Worth noting that whilst the clusters are the same as they went to Eastleigh with (ish - the taillights have been blanked out in addition to being painted blue) the lamps have also been changed out for more modern lamps too. The headlights are the same "retina burner" types as found on 700s and 80x, ditto the markers being changed out for modern LED versions