Reset Brother 4150CDN toner count

Printer just stopped all of a sudden and said I needed to replace the toner, but I didn't see any toner degradation in any print outs.  Found this neat tip:

There has also been some negative comments about Brother colour laser printers refusing to print further once the page count for the toner has reached the perceived maximum with toner still available. This may be so but is easily sorted by resetting the toner count when needed. This is done through the toner reset menu found by simultaneously pressing the "secure" and "cancel" buttons on the printer whilst the toner door is open.

You actually want to press the secure button first, and while you're still holding that button then press the cancel button.