Sorry about the vague message and double post too. 
Remove the switch cover and carefully pry up the switch PCB which may be epoxied down. Insert some instrument into the available space (which can easily be widened since the metal there is pretty thin, )and push (knock) the driver out. The driver is epoxied down too so be aware of that… The wires to the LEDs are 28 gauge I believe so if you can, maybe changing those will increase ouput a tad. Good luck with the replacemnt!