4mm DAT repair recommendations?

Define not working. Do they grab tapes and spit them back out, completely non functional, light flashing (could just need a cleaning tape), etc. -----Original Message----- From: Ian King Sent: Tuesday, September 10, 2013 3:41 PM To: ClassicCmp Technical List Subject: 4mm DAT repair recommendations? Hi folks, I have three external DDS2 DAT drives for a Unisys machine I've been restoring, and none of them work. The original owner of the machine warned me they were not reliable, but I've actually found them quite reliably non-functioning. I performed the prerequisite Google search for information on repairing these drives, and instead I got results about services who repair them. I'm all for that, but of course which one to pick? So here I am, tapping into the Group Wisdom. Anyone have direct experience with such a firm in the United States? Those to avoid are every bit as useful as those you recommend. Thanks -- Ian