As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YEG FLIGHT NR 2315, AIRCRAFT WOULD NOT PRESSURIZE. EMERGENCY CHECKLIST WAS RUN ATTEMPTING BOTH MANUAL AND AUTO WITH NO PRESSURIZATION NOTED. MAINTENANCE INSPECTED DOORS AND SEALS. NO DAMAGE NOTED. ALL DOORS CLOSED AND LOCKED NORMALLY. PLACED PRESSURIZATION SYSTEMS AUTO MANUAL ON MEL21-30-5A, RSI 356337. C/W MEL PROCEDURE 21-30-56. MANUAL SYSTEM OPERATED NORMAL. THIS ACTION CLEARS RSI 356337. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.