I had a Muffler shop take out the pressed studs and replaces them with nuts/bolts.
He did not think there was a leak (although one of the nuts was completely rusted out holding the bank 2 flange). The muffler guy did concur that if there was a leak that air would get SUCKED in (I don't get that one.....) and it would affect that rear O2 sensor.

I cleared my codes and drove away. Several short rides went by and no service light and no "pending codes" on my iPhone reader. Then out for several more short rides and a "pending code" popped up on the Fusion reader. Then the pending code cleared on its own.

Can I still be optimistic that this could be my fix? Could it take some "pending codes" before the long and short term trims are back in sync?
Looking at my logs it looks like my long term are more steady at 5.468 and in the past have seen them as high as 8 on bank 2.

THANKS!!