Hi Ed,
Window in unit - see photo (in next reply). Repairer's response - "The photo shown shows that the window is out of square even with two wheels underneath the window on the window track. No maintenance or repair to fix this issue, which is the gap letting air flow in. The window frame is out of square and needs replacing".
Could i get your opinion. The strata are in the process to the replace all windows and balcony doors. Thx mal