What was found
CLIMBING OUT OF 34,500 THE RED CAS MESSAGE, PAX DOOR OPEN, ILLUMINATED. WE RAN THE QRH CHECKLIST & DIVERTED TO KPBI. UPON DESCENDING TO 5000 WHEN THE CABIN PRESS DIFFERENTIAL WENT TO 0 THE LIGHT DISAPPEARED. TROUBLE SHOT & FOUND PAX MAIN DOOR MICRO SWITCH TO BE OUT OF ADJUSTMENT. ADJUSTED LOWER AFT MICRO SWITCH FOR MAIN DOOR IAW AMM 52-71-20, NO DEFECTS NOTED.