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G5500 Rotor Issue

I bought a used G5500 rotor that the previous owner had stored in a closet for several years and hooked up the power.  The azimuth rotor is functioning as specified but the elevation side has a problem.  When pressing either the up or down switches on the controller, I hear a hum from the rotor, indicating it is getting power, but nothing moves.  Where should I start looking?

73 de W0HV, Jim in Raymore, MO (ex-N8AU)
Light travels faster than sound...  This is why some people appear bright until you hear them speak.

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