Could it be a swap with 044 (yet to be modified)?
Very unlikely to be. 92044 came up from Dollands Moor to Willesden TMD this afternoon (a pretty routine move when it's not down at the tunnel) and there's no sign of any paths that would get it from there to Loughborough.
Moreover, 92044 is in active use at the moment working the China Clay tanks through the tunnel (with 92032) and the Class 700 deliveries. With three 92s (out of ten operational) in Loughborough, GBRf are a bit tight on 92s at the moment (e.g. a 66 is working the Dagenham-Garston cars, whereas they usually prefer a 92 on that).
I expect they'll want one or two out of the works first - and tested then back on revenue-earning work (which takes a week or two assuming all is well) before they send any more in.
92044 also tends to be pretty reliable, so there may be others with a more chequered recent history nearer the front of the queue for being next in (e.g. 92032).
I don't know how separate the engineers etc. working on them are, but there's also two of the Sleeper 73/9s in Brush at the moment and a third en route it appears, which is making options a bit limited on the North of Edinburgh portions, so GBRf may want these prioritised (if there's common resources working on both 92s and 73s).
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