You may find a more favorable code by looking at the end use of the boards, e.g. are these stand alone units and sold as such, or do they interface or operate with some other equipment?

Ah good idea, I'll check that out. These are the only board in a product, but they go into an enclosure and have wires plugged into them. I'll see what I can find on the list.

 

If these are in fact component parts, you may find a more favorable Tariff.