What was found
A/C was originally on a Reposition Flight #422 from ABE-DTW. Enroute to DTW LH Main Buss dropped off line. Crew lost all Flight instruments on LH (Capt) side. Due to weather, Flight was diverted to FNT. Maintenance removed and replaced RH PDU PN A2043C, SN/on CM-10894, SN/offCL-773322. All checks good IAW SF340 MM Chap 24. Ground ran AC for 1 hour, no defects noted.