Do UPS have a FOQA programme and if they do was the aircraft fitted with a QAR? No mention has been made of a QAR module but if it exists the NTSB would know quite quickly what autopilot modes were being used and how the flight was conducted if the disc was readable.
NTSB member Sumwalt addresses the recovery of non-volatile memory from various electronic modules at 8:25 in this briefing:
I would think the FDR data would give autopilot mode status as well.