What was found
MAIN CARGO DOOR WARNING LIGHT ON S/O PANEL AND MAIN CARGO DOOR NOT CLOSED AND DOOR WARNING LIGHT ON MAIN CARGO DOOR CONTROL BOX ALL ILLUMINATED WHEN CABIN PRESSURE EXCEEDS 8 PSI. PERFORMED EMERGENCY CHECK LIST, REDUCED CABIN PRESSURE AND ALL LIGHTS EXTINGUISHED WHEN CABIN PRESSURE WENT BELOW 6 PSI. THERE WAS NOT A CHANGE IN CABIN PRESSURE RELATED TO THE WARNING LIGHTS. ADJUSTED MAIN CARGO DOOR CLOSED SWITCH PER BOEING AND AEI MAINTENANCE MANUAL 5-35 PAGE 135 PART 2A THRU D. ALL CARGO DOOR LIGHTS OUT AND NO RED WARNING ON S/O PANEL AT 8.75 PSI PRESSURIZATION. A/C IS SAFE FOR FLIGHT.