The next few weeks aren't going to be pretty, I fear. Only three six-car sets on the Southport line this evening (and one of those was on a normally three-car working), and that's with 004 amongst them!
507011 and 507023 both in Southport sidings and not used for peak, so potentially two more out of service to add to 507002, 507017 and 507028 on the sick list. 507029 also went from New Brighton sidings to North depot, then back to New Brighton today, although this unit was on the West Kirby line yesterday morning.
Worth saying that despite 508104's many faults, it has remained fully serviceable throughout and still had several years worth of overhaul mileage left. Personally, I think pulling all the 508s early despite several having only recently had overhauls is a big mistake.