It's covered on page 180-182 of the user manual.
Import them (max 50 at a time) to their respective banks (assuming you want it as per it was from factory).
Refer to the "Patch List" for reference.
I have a Porta One that has a couple of faulty pots I'd like to replace.
There seem to be quite a few on ebay in the US, but the shipping costs are just ridiculous.
If anyone has a dead machine/parts they want to sell (and it wont cost an arm/leg to post to Australia!), please get in touch...