Please define 'technical' error.
Does the lender need to go back...YES
if revised HUD-1 not sent within 30 days...YES
I know of no 'outs' in RESPA that give wiggle room like you're looking for. HUD seems to want perfection from the banks on the GFE and HUD or the bank will pay the difference, either in cures or penalties. I don't think anyone's really been examined on the new RESPA yet so it's hard to say for sure. If you look around in these threads tho, you'll see that people are opting to redisclose even if they're past the 30 days just as a means to cya.