The last two channels on both sides of the second layer of the pion rejector (channels 15,16,32,33 in L.prl2) were giving problems signals. As all four signals share the same ribbon cable and ADC input, it was thought that perhaps the problem was because the connection was loose.
Upon examining the connection, it seemed that nothing was loose, so the ribbon cable was moved from the 0-15 slot to the 16-31 slot.
The relevant database file has been updated.