You should have messed with the old green monster PMA, now that was a POS. I'd have to see this problem for myself though, APN-241 does it's own internal BIT and just feeds the results to the PMA. Did you get any fault codes or was it just the generic "Radar Degraded" ACAWS? Which Mission Computer were you using in OMP? can you repeat the write up?
The plane isnt going to a windows based system just the PMA/GMS, might not even see a change in the GUI.