It looks like the Line 2 port was/is shorted out. Do you get this reading even when no telephone cord is plugged into either of the two Phone jacks on the OBi? If so, look closely (with a magnifying glass if necessary) at the gold pins on the jacks, and confirm that they aren't bent and touching each other. If not, and if you have already performed a hardware factory reset, then Line 2 is indeed toasted. This is indicated by the tip/ring voltage being zero, while the VBAT is 14.
It shouldn't cause a problem for the other line. Unless you are concerned about a few pennies being needlessly spent for the ~1/4 watt of electricity used, then I wouldn't worry about it.