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An antenna mounted at 40' AGL is not the easiest to access for close inspection or service... But have you inspected the antenna, matching transformer/network and connectors... closely? If you don't see obvious damage to the antenna, you still need to look for corrosion and water in the connectors, coax and transformer.
Then there's the possibility of ESD (Electrostatic Discharge) damage to the preamp. Often, small static buildup can cause damage that only degrades the performance of a transistor or integrated circuit... not every static discharge causes catastrophic failure.
Have you visually confirmed that the rotator points the direction the controller says it's pointing?
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