Hmm....
While at the dealer, price out what a "Bare" 2305 would set you back..Might be cheaper in the long haul to buy a new 2305, swap on any attachments you can swap and call it a day...and part out your 2210 to pay the difference. Sometimes these machines are worth more as parts then whole...
$2600.00 for the part plus all the labor (unless you can fix yourself).... MSRP on a 2305 from the Deere website pegs it at 11k.... -10% = 10k +/- out the door...hmm....Not saying Its what I'd do for sure, but I'd certianly look into it further... My Gut reaction/feeling is the cost of repair is kinda high compared to the value of the machine..
**edit** googling the values of 2210's and found this thread:
http://www.tractorbynet.com/forums/john-deere-buying-pricing/142393-john-deere-2210-questions.html