That a nice can of spam you've got there, but unfortunately it doesn't answer my question. I don't need to replace the LCD display, I need to replace one of the tiny red LED diodes that sits beneath the button tops.
Anyway, I would prefer a service manual or the schematics for the MP-7, XL-7 or PX-7. But information on a suitable replacement Light Emitting Diode would do fine too.