Was it that unit? It made the shunt move to the sidings @ 16:48 (2 late), having arrived as 2F81 (4 late), the majority of which was unexplained delay, and no reference to engine problems. It then returned to Man Vic as 2J00 (as correctly mentioned) arriving 2 late into Man Vic - delayed in the Salford area by a class 1.
However the following Wigan terminator (2F85 - 16:04 ex Rochdale) arrived 17 late having suffered engine problems from Salford Crescent (unit: 150269) which was swapped for 156454 between Bolton and Wigan Wallgate (the 156 being formed off the 16:48 Wigan - Rochdale service.