how can i fix a, on off switch on my( moffat) hood front panel. i do not ha?

i have a moffat hood. the on off switch on the front panel isn;t working...do i hve to replace the whole front panel, or just the on off switch could be replaced! i don't have moffat hood a model number!! the hood is over 10 years old, colour is baige or cream. the fited hood between the unit, the widh is 60cm(23.75) inches

Mr Bakul Limbachia
May 2012