Hey @HRhode, sorry for the late reply.
Please see this post for a DIY workaround.
Do you mean you did the battery reset as described in the batteryguide?
This should usually help with deep discharged batteries. Unfortunately if you deep-discharge again you’ll have to do it again.
Since you already tried reassembling (and cleaning the connectors?) the next step - which you already did too as it seems - is contact support to get a replacement.
Cleaning the sensor is no longer necessary (unless it’s really really dirty). The sensor can be re calibrated. See here.
You’ll get a free replacement from support. They have new covers now (which will be delivered starting December 16th) and also changed the material for the old designs, so hopefully this won’t happen again.
I guess this was all a citation of a support request you sent to FP? If you didn’t get a reply yet please call them to speed up the process.
Since it seems you have at least 2 hardware issues my personal guess is you’ll get a replacement for the whole phone. I hope it will work as well as mine. 