We bought this and another of its kind from the Scissor Sisters studio along with lots of synths and other gear.
When we got this unit, we had our tech open it to inspect it before powering it up, as we normally do. He discovered that someone had previously replaced some capacitors and that some resistor leads were slightly charred, which he suspects may be normal for this unit. The repair looked good so he then powered it up and tested it and it appears to work just as it should.