I have had photocells fail twice in outdoor 120V lights over the years, and both times they failed so that the lights were constantly on.
If the cost of replacing the part is too high, buying an external holiday light timer with a photocell built in would let you plug in the transformer and use the existing lights.....
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2015 BMW i3 BEV, Giga World (Lodge interior), Tech/Driving Assist Packages, 30K miles
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