On the 3670, the panel on the ODS has four screws in the center joining it to the other panel. There are 3 more that come in from the UDC that need to be removed to get the panel out. The panel on the DS needs to have the cover for the W/D plumbing removed to get it out, along with detaching the electrical and cable outlets. The screws can be a PITA and may get balled up with fibers from the black panel covering.
Once you get the panels off, it's hands and knees in confined, dusty and spaghetti piled quarters to get at anything back there. Have your favorite expletives ready to utter.