Doesn't matter, that you do not use 240 lane. If have error there you can't scan 135 lane also.
When you have 01406-00013 error that means that have errors from few 240 lane sensors. Set 240 lane, go to input check and look which sensors are dark.
When you see error from few sensors can be calibration problem, or problem with carrier hardware. Go to scanner menu and make scanner backup. Then go to afc menu and try adjust sensitivity and intensity for these sensors. If even with maximal value ( 255 ) sensors still dark that means your afc is not working and need to repair it.
It is not some miracle. Now have 7 carriers to repair ( from UK, Germany, Sweden and Latvia ) . All they have various hardware problems and I have to repair them. Rare had to change sensors. Usually other problems cause error.