You mentioned the two voltages on Leg A and leg B, as 105 and 135 volts.
Also used the word 'household' i.e. Residential like.

What was the voltage between A and B? Somewhere around 230 volts?

If so suspect the neutral or zero voltage (middle wire) of the three
incoming service wires is open or very high resistance, somewhere between or
at the power utility transformer!

By the way someone here referred to Legs A and B, as 'Phases'.
In household installations they are rarely, if ever ................. NOT
phases.

In most normal North American (residential, small farm and other etc.)
systems, the two legs are, as it were**, the + (plus) and - (minus) ends of
a 230 volt SINGLE phase transformer supply which has its centre used as the
neutral.

The use of the word phase is not uncommon but is technically incorrect;
except perhaps in the wiring parlance/practice of the industry; where
someone might loosely say "Phase A is black wire and Phase B is red wire."
The two legs are actully the opposite ends of the SAME phase.