What was found
APPEARED TO LOOSE PRESSURIZATION PASSING 12,000' LEVELED AT 14,000' CABIN AT 9500, DESCENDED TO 10,000 AND WAS UNABLE TO GET PRESSURE IN CABIN BELOW 8,000. HEARD LOUD AIR NOISE, CHECKED MAIN CABIN DOOR, FOUND AIR LEAKING AROUND DOOR. RETURNED TO MEM. ADJUSTED UPPER DOOR GUIDE ARM 1/2 TURN OUT IAW B727-200 AMM 52-411-001-5. REMOVED AND REPLACED THE TEFLON RUB STRIP AND MID CENTERING GUIDE ADJUSTED UPPER DOOR GUIDE ARM ROD END, REF 727-200MM 52-11-001-5. REINSTALLED ESCAPE SLIDE. OPS CHECKS GOOD.