Another success story for upgrading a PW2 from 5.7.2.1 to 5.7.3 to cure the "battery drain" issue just trickled in.... this time from the Kindle forum at reddit.com.... the guy got back to me and confirmed his was a 4GB model
So either stay on 5.6.5 with as much protection from OTA updates as you can, or go to 5.7.3 if you want the new UI (but give up any chance of JB for now)
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