Hi Dave
I lost count how many of exactly these Varitronix Displays I have replaced. This one will work for a few month and then fail again.
I assume it is the MGLS-24064-x-x display.
Yours is from 2002 and has actually lasted very long for that particular type. This display in a hand held device does not live beyond 5 years without losling lines.
The best solution is to replace it with a Winstar WG24064 Display or a compatible display from Bolimyn will work also.
They don't use hot bar anymore and made the zebras are a bit longer to accomodate 16 more contacts on each side for the lines, clever interleaved.
Only problem today is: That Toshiba Controller is obsolete, but there is a replacement called RA6963 for it now.