Scott...IMHO it's not the power supply. The motor/power supply is in no way electronically connected to the tonearm.
If you are switching the PSU from 33 to 45 and back again with the record playing, it is probably the little extra vibration and/or the increase/decrease in speed that accompanies this switch that is acting upon the cantilever/tonearm and bringing the right channel back.
Really the only way to troubleshoot this is to maybe take your table to a dealer and swap out the table/psu one at a time to see what the deal is.
I personally think it has to be either the cartridge or tonearm wiring that is a fault.
If you are switching the PSU from 33 to 45 and back again with the record playing, it is probably the little extra vibration and/or the increase/decrease in speed that accompanies this switch that is acting upon the cantilever/tonearm and bringing the right channel back.
Really the only way to troubleshoot this is to maybe take your table to a dealer and swap out the table/psu one at a time to see what the deal is.
I personally think it has to be either the cartridge or tonearm wiring that is a fault.