Can you tell if there is a Manufacturer or part/model number on it somewhere? This will help to ID available parts. Do you know why they aren't working? Thermostat not functioning? Are the bulbs getting juice? Pretty simple theory: between the bulbs and the power cord is a thermostat and maybe a lamp/indicator. Be careful though, electricity should be respected.
You might look around at:
http://www.rockytopgen.com/catalog/incubatorbrooderparts.htmlThey sell coils too.
G'luck
John
When the world pushes you to your knees......you're in the perfect position to pray.