After it all settled out, the actual problem was a Radar Graphics Adapter that failed with heat:
Equipment
Wxp850a control panel pn 622-8393-003 sn257
Radar
Gulfstream Mineapolis drawngs of the EGPWS installation
GDASCWB13490002R___[1] This is the correct one, after much hassle
This a disk of old IAI EO’s
EO_LD—25W810104E002_B_004_01 EO_WD—25W129213_-_002_01 EO_WD—25W129304_B_004_01 EO_WD—25W129304_C_005_01 EO_WD—25W129304_D_006_01 EO_WD—25W129414_-_002_01 EO_WD—25W129503_-_002_01 EO_WD—25W129602_-_002_01 EO_WD—25W129705_A_003_01 EO_WD—25W129705_B_004_01 EO_WD—25W129705_C_005_01 EO_WD—25W129705_D_006_01
Here is the YouTube of the WXA350A failing when warm
https://youtu.be/5lnfkmEuBl0