I got the email this morning, but mine has not yet been changed from 30. I had already gotten a replacement cord from Ecotality last year for this problem. I called them. They told me the problem is with the cable, not just the plug. They are going to send me some paperwork in the mail to get approval to change it back to 30! If they actually remotely change it to 24A. Thanks for the post on how to do it myself. I'm leaving mine online because I like to see the start/stop updates via email.
2011 SL-e, silver, VIN 8198, delivered 11 Sep 2011. 37k miles, ~200 GIDs, 9 bars (1st bar lost 3 April 2014 @20,700 mi, 3rd bar lost Aug 2017)
2015 e-Golf SEL
2013 Fit EV, VIN 151, delivered 17 Nov 2012, lease return Nov 2015 at 30k miles
7.7kW solar PV