[TenTec] Omni-VI plus question

[henry at summitschool.com]

Our club is considering selling an Omni-VI PLus transceiver and power supply we acquired from the original owner which works and looks FB but will be surplus to our needs. The rig has the 1.8 SSB filter and the manuals. Is there a way to find out the version of the firmware so we can tell potential customers? I dont see anything in the manual as far as a menu item, etc.
Thanks for any help-
73-
Henry W2DZO
Treasurer, Forsyth ARC
Winston-Salem, NC