NAD 352C - converting from 220v to 100v

I have NAD 352C amp (220v) and I need to convert it to 110v. The manual says the C version (220v) uses main transformer TD-230-0150E, while the AH version (110v) uses another transformer TD-120-0150I.

Question: Do I need to change transformers or there is any way to re-solder? Rewire?

Where can I get an OEM (or alternative) transformer? In case of non-OEM - what transformer can be an appropriate substitute? Any place to buy apart from ebay?

Thanks!