I got very good response from Jack Watkins at  VMS Tech Support [support@visionmicrosystems.com].  I needed a new inverter chip for my older model VM1000 and he sent it out in the day after he got back from Oshkosh.  I used email, but his contact info is below.

Jack Watkins
Tech Support
Vision Microsystems
(830)755-6330 phone
(830)755-6332 fax


Tom O'Grady
Anchorage, AK
N241DM