LCWRA MR

Hi everyone I'm new here. I was originally awarded LCW. I put in an MR and won and I was awarded LCWRA. I've asked UC for a copy of my new report to see which part got turned over (i disagreed with points on 3 questions in the questionnaire that could have given me the 15 points needed, and 2 parts at the end which automatically give you LWCRA if you meet the descriptor. UC say the assessment report hasnt changed just the decision as a new DM reviewed the award so all I get is a letter stating its been reconsidered and changed. I REALLY wanna know which part was overturned and why. I'm also applying for PIP so think it could be good evidence to send but i cant send the original report as it's obviously wrong. UC are saying there's nothing else but surely there must be a statement of reasons to change? Any advice? Maybe I'm asking the wrong questions? They just keep saying all they have is the original report which I have a copy of. Thanks x