If they're saying it is a bad condcutor plate again, then it should be replaced under warranty at no cost to you, seeing as how you bought it from a dealership. It's a "parts warranty" issue.
After that you may be looking at a control unit or valve body issue. I am assuming there was no visual evidence of wear/internal failure because they would have seen that and advised you when they (Indianapolis) pulled the valve body out the first time.
Also conductor plates are often replaced due to speed sensor faults. The speed sensors are integrated into the plate. I've often found codes for speed sensor faults when there is fluid in the control unit. Ask them to check for fluid contamination in the ETC unit, they shouldn't charge you to just check. Good luck.