[Repeater-Builder] ge voter receive modules

[jon60070]

 Ijust was looking at the receive modiules in the voter i recentely
got and noted that there is no input level adjustment. upon inspection, 
i noted there are 2 boards in the module, the normal one as the 
schematic shows and the 2 nd one which is not documented (p/n 
19d429656g1 ) is this an input agc bd? any ideas?