I had a little tour of the network on Saturday afternoon in between various walks and below is a quick update of what was about.
In service on the Northern Line: 507001, 507002, 507004, 507005, 507008, 507011, 507013, 507014, 507015, 507020, 507024, 507027, 507031, 508103, 508108, 508112, 508115, 508124, 508125, 508127, 508128, 508138, 508141.
In service on the Wirral Line: 507003, 507012, 507025, 507026, 507032, 507033, 508111, 508114, 508117, 508122, 508126, 508130, 508131, 508137, 508139.
Stabled units
At Southport: 507007 (Southport siding no. 10) and 507018 (Birkdale siding no. 1).
At Kirkdale Depot: 507006 and 507021 were the only numbers I could see. Both are still in full public view and damaged 507006 is in the siding closest to Kirkdale station. A masked unit was in the back sidings; 508140 is my guess as it looked fairly clean.
At New Brighton: 507016 (siding no. 1), 507023 (wall siding), 507029 and 508123 (both siding no. 2).
At West Kirby: 508120 (siding no. 1).
At Hooton: 507009 (platform 1).
That leaves 507010, 507017, 507019, 507028, 507030, 508104, 508136 and 508143 (or possibly 508140) unseen. 507019 had spent a period stabled at New Brighton alongside 507016 (I saw it there last Thursday). I haven't seen 507010 in ages now. Several of those out of service are having their remaining mileage managed as they approach their next overhaul.
I hope the above is of interest to a few out there.