Genie powerhead light(s) won't turn off

I have an old Genie garage door opener (can't tell which model, but it's a screw drive). When the door opened, the garage door opener unit (powerhead) light (two light bulbs) would come on, and after a delay (a minute or so), the light would go off. Now, the light no longer turns off.
Is there a quick fix to this, or must I replace the garage door unit?
If I do need to replace the power head, how easy will it be to integrate with my pre-existing screw setup?
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Some of the older Genie garage door openers have a switch on the motor head to turn this feature (light stays on constantly while door is open) on and off. Facing the motor head (back towards garage door) it should be just above the right light bulb. It is a spring loaded pin that comes thru the motor cover w/ another small pin stuck thru the end. In one position the light shuts off in both directions, in the other the light will only shut off when the door is closed. Genie switched the two positions of the pin at one point. So if the circuit board was changed the pin had to be moved to get the light to go off. I believe at first the pin touched the board to have light go off on open, then they switched it to the pin touching board would keep light on while open.
I believe (not postively sure) that your opener is a model 450 or 459. They have an off yellow motor cover. If you want to replace, you will be replacing the whole unit. First off you probably wouldn't save any money if you could change just the motor head. Secondly the designs have changed & and the old screw would not work on a newer motor head.
Doordoc www.DoorsAndOpeners.com
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