The DF30E error is a non-recoverable software error in the scan convertor electronics. The EE5E2 is a conditional error that means a bad test RF signal in the scanner. (I'm not sure what that means. It sounds like it has to do with a diagnostic test the system runs to check the hardware and software.) This could be caused by a bad Key Processor board, or one of the other 2 boards that have the software that controls the system.
Are you able to get to press the Test key and get to the main test menu in order to run diagnostics and look at the error logs? My guess is that you will not be able to get into Test. You may need to go to a minimum configuration and run the Stand Alone Basic test to isolate the failure.