An increase of cells that produce norepinephrine cause the non-motor symptoms of parkinson's disease.

False

A person with Parkinson’s disease losses cells that produce norepinephrine, which causes the nerve endings to produce several of the non-motor features seen in person with Parkinson’s disease including fatigue and abnormalities of blood pressure regulation.
In addition, norepinephrine is important for regulating the activity of dopamine neurons and when the dopamine neurons start dying, the norepinephrine neurons send signals to the surviving dopamine cells to dramatically increase their activity and the output of dopamine as to ameliorate the symptoms of Parkinson's disease.

Olfactory epithelium i believe