Lestronic Charger

Come up with a new problem for me. Plugged in my lestronic 36v charger to battery pack. Charged for a bit then shut off. Maybe half hour. Battery pack voltage was only 36.7v. Unplugged and plugged back in, charger clicks but that is it. No hum, nothing showing on meter. Has my charger gone bad on me? If so how do I check it to find out? Fuse on charger did not blow as far as I can see.
Any ideas?

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