A maintenance technician notices intermittent vibration on a conveyor motor that only occurs during the first 20 minutes of each shift. Temperature readings are normal, and the motor passes all static electrical tests. Which diagnostic approach is MOST appropriate before replacing any components?
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A
Replace the bearings immediately, as intermittent vibration is a classic early-stage bearing failure signature
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B
Log ambient temperature, load conditions, and vibration frequency over multiple shift starts to identify a pattern before intervening
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C
Increase lubrication frequency and monitor for one week, since thermal expansion during warm-up is the most probable cause
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D
Escalate to engineering immediately, since intermittent faults cannot be diagnosed at the technician level