Spend some time searching around this forum--there are many good threads in which people have documented with photos their restorations of the MA6100, which will give you ideas as to what things should look like to be able to access the controls.
The MA6100 has a split chassis--the switches and selectors are mounted on the bottom half, and the pots on the top half. The switches and selectors are accessible from the bottom with the bottom cover off. You'll have to carefully aim deoxit at the switches by threading the deoxit can straw through the various wires to the switches. If you want to physically take the switches out to clean them, make some really good wiring notes and then break out the soldering iron.
The front glass is two panels held in a metal frame. Take off the knobs, then unscrew the screws that hold the metal frame of the glass to the chassis. The glass should be able to be helped off carefully once the screws have been undone. (Note: take off the glass before you spray chemicals inside, as the chemicals can peel the paint off the inside of the glass).
The pots (use faderlube only) are accessed by taking off the top, then removing the front black metal cover over the circuit board, and then moving the circuit board. To find the screws, you may have to hunt around on the top, bottom, or sides of the chassis. Once the circuit board is exposed, you will have to find the screws holding it in place, and remove them. If you can move the circuit board around, great, you can thread the faderlube straw around it and hit the pots to clean them. If you can't get at the pots by moving the circuit board, you may well again have to make some good notes and then break out the soldering iron.
