Havent seen many etacs issues but I would let em goodwill the radio. They could just unplug the radio and leave it installed I have done that before. Being its gonna just be a float radio replacing it is easiest way.

Update 4
 

5 days after the "repairs" - battery is dead after only 38 hours. I've started the BBB Auto Line arbitration process in order to avoid falling out of warranty in about 5000 miles. 7 repair attempts and 25 days out of service is as far as I can go. Just in the initial stages now. Keeping my fingers crossed for a speedy resolution. BBB's goal is 40 days.

Any update? I have an 06 manual as well so I'm curious what if anything fixed it so I can keep an eye out.