Yes 196.3v is too high, you need it 190 or a little less (seems around 187v is ok). Now (again my rudimentary understanding, MJMP correct me if I'm wrong), R913 is the component that affects this voltage ? So you may need to replace it again ? (you get one with the noise mod kit from MJMP BTW). I agree, doing the whole noise mod is a very good idea
. Getting a decent solder station is also a very good idea. (and a decent desolder station even better (but not as essential). A quick check though, reflow R913 (remelt the solder joins) and test again (I don't think it will fix it but easy to try). BTW a bad solder job can always be a contributing factor.
The noise mod instructions are here (http://adadepot.com/mods/MP-2-NoiseMod.pdf), have a read it's hard to make this "noob-proof" but MJMP (and I to the extent I can) will help you if you need.
Some advice, line up your ducks, learn all you can/need before you start. Tomy has just done this mod, he can also help and has some good ideas to make it easier,