I saw that one of the larger online stores that sell used equipment in the US had two pair of DSP7200 that were advertised as being .2 a few weeks ago. Not sure they were really 7200.2s, but both sets are now gone.

Agree with others that it is really unlikely that you will find a set of upgrade boards floating around. Probably better to return them.

Theater: 861v4_LPS, 818v3, HD621, Oppo 203, Lumagen Pro, DSP8000SE, DSP5500C, SW1600x2, DSP5500, Epson 6040UB, PS4
Living room: 861v4_LPS, HD621, DSP8000SE, DSP5200C, Oppo 203, Lumagen 2143, 818v3, Sooloos/MC600 Bluesound Node
Bedroom: M80
office: G68D, DSP6000
Garage: DSP5000
Storage: M33s, DSP33s, DSP5k, 501, 518, M1500, G98DH, SW1600