Craftsman 139.536 Unit: Both Sensor Lights Out

Both of my sensor lights went out the other day.  Everything else on the unit works fine.  I've begun the standard troubleshooting such as realignment, lens cleaning, and re-splicing the connections to the sensors from the unit.  It seems as those the power to the sensors was lost.  I still need to go home and actually check that some more.  I think I might just need new sensors, but seems odd they would both go out at the same time.  So before I spend that $40, I am really just curious if anyone else has had this power loss as well, and is there an easy way to find out of the wires have shorted somewhere?  I am really trying to avoid pulling everything out and rewiring the sensors.  FYI, the unit is 17 years old from what I can tell.

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