Genuine Toshiba owner's manual. Couldn't really ask for more. And written in understandable English in contrast to a few recent experiences I have had with manuals for other equipment other than Toshiba but made in China and written in "Chinglish"!
Text excerpt from page 32 (click to view)
Shelf Support Rails
The shelf support rails on the left and right hand sides of the oven can be removed for cleaning the side walls. Removing the shelf support rails First pull the front of the rail away from the oven wall (1) and then unhook at the back (2).
Fitting the shelf support rails
Important! The rounded ends of the guide rails must be pointing forwards!
To re-insert, first hook the rail into place at the back (1) and then insert the front and press into place (2).