Hi Ron,
Yes, I had to reprogram the replacement PIC, as I said, I used the Pickit 2 on my laptop running Windows 10 and the standalone Pickit 2 application, the .hex file is available on the designers github There is also the info here about the modifications for lower power use and several other things that you can customise, by simply editing the eeprom contents in the pic, again done through the Pickit 2 programmer application.
Other than the blown up PIC issue, caused by me, the ATU has been really good, as people have said, it doesn’t use latching relays, but for the price, you can’t complain.