What was found
IN CRUISE FLT LEVEL 370, AIR COND DOOR LIGHT ILLUM. CONSULT RED TABS, RETURNED TO ANC. DOOR LIGHT WENT OUT AT 6.5 PSI. BEG TO BLINK WHEN INCREASE PSI AT 7.0 PSI. A/C RELEASED PER MEL 52-4D. A/C COND DOOR CAUTION LIGHT INOP. C/W MSP 52-4C, DOORS ARE VERIFIED CLOSED AND LOCKED.