Drivers window motor and cable regulator fails first because it's opened 3 times or more often than any of the other 3. Because your hearing the relay, and because it has operated, you very strongly have a motor going out. If you heard the motor just spinning then it would be the regulator. Pull switch assembly and be sure you've got power/ ground, and continuity at switch. An old trick I've always done on failing motor, is to lightly tap motor with panel removed. You only get 1 or 2 movements on failing motor. So be prepared to pull and replace.
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