What was found
PDX FLIGHT NR 2094, UNABLE TO CONTROL CABIN OR FLIGHT COMPARTMENT TEMPERATURE IN MANUAL MODE. PERFORMED PACK VALVE UNLATCHED CHECKLIST AND TEMP SEEMS CONTROLLED IN BOTH MANUAL AND AUTO MODE. MAINTENANCE COMPLIED WITH FUNCTIONAL TEST OF TEMPERATURE CONTROL SYSTEM IAW DHC-8-200 AMM TASK 21-60-00-720-801. FUNCTIONAL TEST GOOD IN BOTH AUTO AND MANUAL MODES. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.