Yes, they changed the PFCU’s and Engines for airworthy items amongst other things.
But they were a different kettle of fish, the RAF stuffed them in big bags to protect them as recommended by an engineering officer, however the same engineer recognised this would turn them into giant greenhouses, so he also recommended that they had dehumidifiers installing, the RAF chose to skimp on that and the result was the spars sitting in their own swimming pools for years, the bags soon deteriorated in the wind and they were never maintained as far as I could see....
Then we had the fire that destroyed a lot of the RAF VC10 spares holding meaning we started to rob them, I took a booster pump housing out of one wing to replace a porous item on one of the C1’s and all though we taped over the resulting open hole, the wing was in effect compromised.
We were amazed at how in a relatively short time they had deteriorated especially as the none bagged gulf one back at Brize was still in good condition, the consensus amongst us All at the time was they would have faired better if simply parked and left.
The surviving 10’s have been maintained on a part time basis often by ex RAF VC10 engineers and following RAF procedures, they also have been ran and the systems functioned on high speed taxy runs. They have been well looked after under the care of the teams involved, an example of how well they get looked after was the inadvertent Victor tanker short flight and controlled landing some 10 years after its retirement.