As per the AvHerald/Preliminary report (
avherald.com/h?article=50f4076e&opt=0):
Postaccident examination of the airplane revealed that the left main landing gear door actuator retract port hose was leaking hydraulic fluid. The hose was removed and retained by the NTSB for further investigation. The examination also found a discontinuity in the wiring of the landing gear alternate extension system. The section of that wire was retained for further examination.
Looks like electricity was involved with regards to the alternate gear system, but not in the way that we thought..... How interesting.