You don't say which rig you have, but as mentioned, you only need a screwdriver to remove the panels. If you have a 3670, or other model with a W/D in the front, you will also need to remove the cover for the drain/plumbing that runs across the DS basement hatch, if you want to get that panel off.
The panel on the ODS is held by four screws in the center, holding the two panels together, and four more in the inside corner of the UDC. Once you've pulled those panels out a couple of times, you realize what a PITA it is, especially to get at the back of the UDC. What to do, you ask? Modify the panels to have easily removeable access doors.
This is my version, there are others.
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