Yeah, I moved from G6 to Y26 a few weeks ago. As long as you're not going up or down in price (and even then you might just be able to pay/receive the difference), call up the ticket office and let them know where you want to move.
jc32370 Does anyone know if you are allowed mid-season to change seats without a charge?
Contact the ticket office to check for sure if & when you are able to. I was able to in (I think) 2012 at Christmas/New Year when half-season tickets were on sale. I got one for my wife on condition I could move my seat next to hers. Outside those times it may still be possible with effect from any games they haven't put on sale yet.