The question is just how he bypassed that NC seat switch? Also note many these have connectors with a shorting strip to prevent someone simply un-plugging it.
Also I think he means he replaced the switches. but didn't replace the RH arm switch which sounds it is defective.
Sure would be nice to have a wiring schematic for this mower. IF has relays that would be indicated on most IPLs but the IPL for this mower is pretty crappy.
Definitely no support from Husqvarna since they kill off the Dixon line back in 2014.