Here is the website that I used to guide me through the modification process on my 706MKIIG:http://www.qsl.net/k5eph/706.htm
This website has good pictures, and good instructions. The biggest danger you face is not in damaging your 706MKIIG running on 60M, but rather, damaging it while doing this mod. The surface mount diode in question is VERY tiny.
Good luck and 73