HP / Agilent 8349A Microwave Amplifier 2-20Ghz With Option 001 - Fair Condition 156109514897 displays error code r31

displays error code r31

Manufacturer MIdmark Model Number 9500 HD SKU 19-66442 Ref 23-111560

Manufacturer Digitech Model Number TSR-24S SKU 19-75923 Ref 23-109149

Manufacturer ICOS Model Number MVS6001 4/0/9 SKU 19-35285 Ref 23-46576

Manufacturer Cisco Model Number SG300-10P SKU 19-43223 Ref 23-114440

HP / Agilent 8349A Microwave Amplifier 2-20Ghz With Option 001 - Fair Condition 156109514897 displays error code r31Condition Used Description This item is fully tested and in excellent working order. Item will come with a 30 Day Warranty. Cosmetically in fair condition showing moderate to heavier scuffs scratches blemishes from previous use. There is corrosion rust on screw heads and top of faceplate metal. Unit is missing screw that holds down half of the handle. Includes Microwave Amplifier 2 20Ghz With Options 001 as pictured. No additional items or accessories