While troubleshooting intermittent failures of the ship service refrigeration system you suspect the problem is with the lube oil pressure differential switch. The recommended course of action would be:

Correct Answer: Option D — Replace the switch as there is generally no adjustments available on the switch.

Lube oil differential pressure safety switches are factory-calibrated safety devices with non-adjustable internal mechanisms. Tampering or field adjustment is prohibited, requiring direct component replacement upon operational failure.