The numbers all make sense, the L-N numbers are all off by the approximate potential of 18 volts on the neutral. The L-G measurements are accurate since the EGC is at or near zero.
What doesn't make sense is the measurements taken at the sub panel. When the remote pedestal that is supplied by the sub panel is loaded, measurements at the sub panel indicate the open neutral is further upstream, yet when the sub panel is loaded directly in the storage building with a 120V load everything looks normal.
The only thing I can come up with is the problem is in the sub panel somehow got fixed when the 120 load was applied, otherwise the 120V load would not function. The sub panel contains only a single pole circuit for lights and plugs and the 2 pole 50 for the RV pedestal. The 2 pole was switched off when the sub panel was load tested on the single pole circuit.
If you look at the blue column below, the open neutral appears to be upstream of the sub panel, but looking at the green column now it appears to be between the pedestal and the sub panel. It's not making sense to me. Where is the break??
