For those that have done it, is replacing the OpAmps in the Denon 2900 a matter of pulling the old ones out and snapping the new ones in or is there soldering required? Since I have never modded anything, I figured that anything that I can do to improve the sonics on the 2900 that didnt require soldering would be the best place to start. If the OpAmps do require soldering, are there any other easy mods that a newbie like myself can do on the 2900 without getting in trouble by messing something up?