Global 6000 captain reported getting an amber CAS message for a right bleed leak and contacted their maintenance controller.

Narrative

I am submitting this report due to push back received from a Maintenance Controller. Upon contacting a reference an Amber CAS message for RIGHT BLEED LEAK; the controller appeared unwilling to accept my findings. The controller questioned my observations and my conclusions without providing assistance and appeared to push back on the AOG. I explained that we did follow procedures found in the Global AOM (chapter 4) which emphasized the need to shut down the affected engine and contact Maintenance Control. When the controller realized he was unable to push further; he asked what we wanted to do? I informed him that an AOG would be necessary and he quickly ended the call. The plane was placed on AOG and properly written up. Suggestion: Maintenance controllers should not assume a 'combative' approach when pilots are relaying observations. This should be a collaborative approach to ensure safety of flight at all times. Perceived pushback could set up a dangerous precedent that shuts down necessary communication between crews and maintenance controllers. Unfortunately this is not the first interaction that I have had with this controller that was met with resistance. I suggest that controllers be made aware of the necessity for a team approach while working through the issue versus playing 20 questions and offering no support.