The repair work on the sliding door was sensational. The door had been repaired a few years earlier, at over 3 times the cost of what Door and Window Maintenance Victoria (DWMV) charged.
The DWMV representative was polite and knowledgeable, and not only remedied the original issue, but (after discussing the benefits with me) made some additional improvements.
The rep arrived on time, and completed the job promptly. The work is covered by a one year warranty. I would recommend this company to anyone with sliding door issues.

Approximate cost: $150.00