Prophet-VS synth fault, some display lights, no sound.

Prophet-VS Fault on switch on, some display lights, no sound. See description below.
Published on Jan 23, 2018
Prophet-VS Fault on switch on, indicators light, then goes to 00, no response or sound. MVI 6727. Fault appeared early 2018 after the unit had functioned for 18 years. Fault came on instantaneously during playing of the arpeggiator.

Emulator III Rack mount version: some sounds and the disk space / memory screens: