My amp (6058-H323) went out in my Hardinge 42. Sent it in for repair and its NOT repairable. Service center wants to charge me $6400 for a remaned 6058-H334. I am finding drives on the bay much cheaper. Just need to know what amps will interchange with 6058-H323. And if I do find an interchange will I need the top board bc I have already gotten a remaned top board, but it was for my H323.