I was on a 377/1 that had been done (new low-level light by the coupler) but had not had its front lights revised (still had headlight/marker light/tail light rather than headlight/combined marker & tail light), which is interesting when there are 377/1s with both configurations.
I don't think that the main lights were ever in scope! Don't forget that it's only the first 40 377/1s (and the /3) that have the triple front lights so there's around 25 377/1s that have got the more modern light units