Chip replacement in a Del is easy. Unplug it from the spa - take it out of the spa. Four screws on the back - six on some - and the thing will be open. Look at how it is wired: you will unplug four wires, lift out the chip, wipe it out with a soft cloth, set the new chip in place and replace the four wires. They are not polarized - there are two types of connectors - as long as you get the right type of connector you are good to go. Be sure not to pinch wires in between the two halves of the housing as you reassemble it.
Should be good for 9000 hours of operation.
I sell the chips for $69 + tax. However, if a client brings in the unit I will gladly install the chip in it for no additional charge.
8-)