Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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I've got a Craftsman 1/2 HP garage door opener Model 139.53985D. Recently both bulbs went out and stopped working. I know some post problems on here about the bulbs burning out prematurely, but I've had decent luck with the bulbs lasting. I've tried replacing both the bulbs with brand new high efficiency bulbs and still nothing. When someone walks through the motion sensors, you can hear the opener "clicking" as if to turn the bulbs on, but they don't come on. Any suggestions? Thanks!

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