Yeah, technically there was this: Disassembly guide
However, it only covers removing the flap for the SD card, not the panels. I ended up using a pocket knife, although the plate plastic inevitably got dinged slightly. Yeah, the antenna placement is not the best given this is supposed to be a modular router… I’m not sure whey they would tape them to the parts that get moved around when updating the module setup.
Based on what other people seem to be experiencing, I seem to be in a similar boat of having HW failure given the lack of new DHCP lease. Time to see if I can join the efforts in another thread to resolve.