Here are pictures in a gallery form of the Flex-5000A being unboxed and of the radio being opened up after consulting with Flex-Radio due to the small noise of something loose inside.
I have the radio off-line presently, as I need further direction from Flex-Radio and will call them tomorrow.
Loose in this particular rig were several screws and washers. These were likely an assembly error when installing the RX2 unit at Flex-Radio.
Transmit problems suggest that at least one loose item is someplace unfortunate. Their support tech feels the same.
Most certain we will be able to sort things out quickly.
Everything, including their support, has been first rate.