R7000.19
 
Here are the details of a mod I sent to MT a few years ago:
 
This will change the function of the MS key on the remote control to
select SELECTED MEMORY SCAN instead of MODE scan.  Why they didn't
provide this as a function in the first place seems rather odd.
 
On the remote control option board inside the R7000, remove the
cathode of D40 from the board and bend the diode up slightly.  Attach
a small wire, like #30 wire-wrap or something, to the lifted cathode
and tack solder it to the cathode of D32.
 
You could do this with cuts on the board but the tack solder method
allows the mod to be backed out easily if needed.
 
An alternative method is to run the wire from D40 through the hole
where it used to be, and solder to the gray wire (pin 8) of P1.
 
 
I figured this out with a scope and the schematic.  The switches are
all polled by the CPU through a diode matrix.  Lots of combinations
are possible but I didn't fool around too much.