Patio Doors.

John P (Duga) has done his, I know they're smaller than yours and sit at an angle, but I'd guess the process is the same.
 
Assuming the sliding patio doors are manufactured by Trend Marine then they do new locks, rollers brush seals etc.

I have had them done on my curved doors by one of my blokes , its a bit of a fiddle but OK.
 
Have a close look at the bearings. As a comparison the sliding entry door on a Targa 31, although made by Trend actually uses runners and bearings by Holt Products (Make bits for saily things). They were the runners from a mainsheet traveller.
Replacement bearings from Holt were about 1/4 the price from Trend.
Changing was dead easy but a bit fiddly
 
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