The concert is set to take place on April 27
The source ruled out the poisoning angle in the death.
The Forensic Board chaired by Dr Sudhir Gupta has submitted its conclusive report with the Central Bureau of Investigation (CBI).
Doctors have pointed out the dim lighting in the post mortem room of Cooper Hospital. Sushant's autopsy was carried out by three doctors of Cooper Hospital on the night of June 14.
The source further said that the missing timing of death was another point where the doctors have raised concerns apart from uncertainty about the substance that was found in his stomach.
The source explained that the focus on the contents of the stomach highlights what Sushant had for dinner on the intervening night of June 13-14 and breakfast on the morning of June 14.
However, the doctors have ruled out the angle of "organic poisoning" as the cause of death. CBI officials remained tightlipped on the submission of the report to the agency.
Dr Sudhir Gupta, meanwhile, in a statement said that Medical Board of AIIMS has expressed very clearly and conclusively medico-legal final opinion in this case to the CBI. He further said that the contents of the opinion shared with the CBI cannot be shared to anyone as the matter is "subjudice".
Sushant was found dead at his apartment on June 14.
The concert is set to take place on April 27
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