Need a service manual for a Tecumseh engine Mountfield ?

I have a 20-year old Mountfield Empress with a Tecumseh engine. It has been very reliable, so I thought it was time I gave it a proper service. (The last one must have been over 5 year ago). I can find my operating manual, but not the service manual. Is there somewhere I can get on online, or failing that, does anyone have one they could scan, please? (The english pages only!)