A rooftop equipment curb creates a roof transition with multiple possible water paths. The membrane, counterflashing, equipment drainage, and unit condition may all deserve investigation. The drip location below is not enough to assign responsibility.
What to do next
Coordinate roof and mechanical access before the visit. Ask for photographs of the curb perimeter and an explanation of any inaccessible details. A repair scope should state whether equipment lifting or mechanical work is included or requires a separate contractor.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.