During a post-installation pressure test on a closed-loop solar thermal system, the pressure drops from 30 psi to 22 psi over 15 minutes. What is the most appropriate next step?
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A
Refill the system and retest after 24 hours
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B
Locate and repair the leak before returning the system to service
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C
Document the drop as within acceptable variance and commission the system
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D
Increase the expansion tank pre-charge to compensate