I do not see any problems with it, you may want to take it up with your union representative.
If they don't value you - you owe them nothing. You can offer to be available on phone for 3 months if they have any questions. You should already have written comprehensive system documentation, if they are unable to use that it is their own fault.
Too bad about losing vacation days, but that's common when changing employer. Just deal with it and move on - you will (hopefully) make your life better.
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"It is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring" (Carl Sagan)