Resoldering the leads can be a bit tricky, but it can definitely be done. The pads don't take tin/lead solder well (someone mentioned the pads are aluminum) and even when you get what looks like a good joint, they may not conduct and need to be redone. Having recabled a set of T50RPs, I don't think I'd do it again. Even with a cold, grey joint, they sounded good and the recable didn't make them sound better. (I went to permanent dual entry with a single quarter-inch TRS connector)
Resoldering does much better if you clear away the original solder and use something like Cardas quad eutectic which melts at a lower temperature. This way you can also be better sure that your wire is touching the pad, not just floating in the solder.
Also, ditch the original wire. It hated to take up any flux and tin properly. I was going to use the stock cable until I had such a hard time tinning it. That is when I completely recabled.