Replacing the main sail is easy, especially since you have the mast raising 
system. Lower the mast, disconect it at the bottom and the entire furling 
system, sail and all, slides out the bottom. The sail is held onto the furling tube 
with two screws. Undo the screws and the sail slides out of the grove in the 
furling tube. If the damage isn't to severe, you might want to try sending it 
off to a good sail loft, such as sail care and have them repair it.
The next time something binds like that, try raising and lowering the boom 
position to see if that frees it up. More than likely there was some debris or 
mud daubers next built up inside. Check the bottom of the mast after lowering 
it to see if anything had fallen down during the process. That's usually where 
it ends up if anything was caught in there.
Be sure to lubricate the bearings and clean any debris off the furling tube 
prior to reassembly. This is an easy project. Once you do it, you will have a 
better understanding of how the furling system works and how simple it is. 
Don't forget to count the turns on the furling line prior to disassembly so you 
will know how many to put back.

Rummy