Well, if they cannot give you a lower mark in terms of your HSC marks, then naturally your UAI cannot be affected 'negatively'.
That is, if you were to gain a few more marks in each subject, your UAI will be recalculated - it will be higher than your current UAI, if I understand correctly. Reading through this thread, as others have noted, if it is a win-win situation, then you would be gaining marks, (or no change). If you're going to be having a few more marks added onto your exam mark, this would then influence your HSC mark - and in doing so, effects your UAI.
I'm just curious though, braindrainedAsh - how exactly do they recheck EE2? There had been no exams, so would they have to re-mark your Major Project and/or Reflection Statement? That would involve re-reading or re-viewing your work, would it not?
If this is the case, I would be very interested in having my EE2 Major Work (poetry), Major Work Journal (if required) and Reflection Statement re-read, as I believe a 'higher' mark in EE2, in contributing towards my Top 10 units would increase my UAI. That is to say, if EE2 scales as well as it should, it would then replace any units that were halved or included in the calculation of my own UAI (I believe they would have included ME1 over my EE2 mark).
Best of luck to those requesting clerical rechecks, although I would like to hear from those getting EE2 Major Works re-checked (not necessarily remarked).