Even after bringing up the fb40m, I was unable to get the front ends to come up, as they would error out with an RFM problem.
We proceeded to reboot everything I could get my hands on, although its likely it was daqawg and daqctrl which were the issue, as on the C0DAQ_DETAIL screen their status had been showing as 0xbad, but after the reboot showed up as 0x0. They had originally come up before the frame builder had been fixed, so this might have been the culprit. In the course of rebooting, I also found c1omc and c1lsc had been turned off as well, and turned them on.
After this set of reboots, we're now able to bring the front ends up one by one.