As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 DU DISPLAY FAILED INFLIGHT. SLIGHT SMELL OF ELECTRIC SHORT OCCURRED BUT DISAPPEARED AFTER DESELECTING NR 1 DU AS THE PFD DISPLAY. VERIFIED DU870 DEAD. REMOVED AND REPLACED NR 1 PFD AND OPS CHECKED FUNCTIONS NORMAL IAW CESSNA 750 MM CHAP 34-25-01.