Stabled overnight at Wigan North Western - booked 150+142, on arrival at Lime Street does the 23:15 to Manchester Airport.
I have to admit that I had misread RTT, I thought it remained on Prestons for the rest of the day, which it clearly does not.
According to RTT on arrival at Lime Street it goes into platform 4, followed not very many minutes later by the 0845 ex-Oxford Road, due Lime Street 0951. This is in turn replaced on CLC stoppers by the stock off 2F03 (0844 ex-Airport or 0859 ex-Piccadilly, depending on the season).
It would appear that it is the 2215 Airport (rather than 2315) which is formed from stock which has been lurking in platform 4 for much of the day, but if 2C23 (0847 ex-WGN) is formed of a pacer/sprinter combination, and the 0951 arrival ex-CLC is (at least) a single pacer/sprinter, then there must be at least three DMU units stabled in platform 4. I'm sure that the 2215 Airport isn't a triple, so some info must be missing, I think.
The 2315 Airport apparently forms from the stock off the 2145 ex-Oxford Road, due Lime Street 2248.
Which rather leaves one burning question unanswered. If the pacer/sprinter combination stables in platform 2 at WGN (which it does), how come the 0847Su departure for Lime Street apparently departs platform 6? There's no mention on RTT of a shunt move (they aren't always shown, I know) but why would there need to be a shunt move anyway? There doesn't appear to be a problem running service trains from platforms 2/3 (the 0644 to Lime Street departs 3 on Saturdays) and there's access from platforms 2/3 to the St Helens line (5F51, 0534NSSu ECS WGN to SNH, also departs 3).
Talking of 5F51, I see that from 11 December it becomes 0535, departing platform 4. It's timed for a 319, as is 2F51 (0558 SNH to Lime Street) and 2N71 (0756 Lime Street to Preston), which is what I reckon it is going to be doing after that.
Rather suspiciously, the Sprinter (usually a 156, I believe) which has stabled the previous night in platform 3, and which would under the present regime do 5F51, doesn't appear to go anywhere. What is at present its next duty, the 0745 Lime Street to Oxford Road, is going to be covered by the unit off the 0605 from Stockport.