As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2207 - FLIGHT COMPARTMENT DOES NOT PROVIDE ADEQUATE HEAT IN BOTH AUTO AND MANUAL MODES. CABIN WORK NORMAL. PERFORMED DELATCHING PROCEDURE IAW DHC-8 EMERGENCY AND ABNORMAL CHECKLIST AND ADJUSTMENT TEST 21-60-00, PAGE 501-502. OPERATIONAL CHECK GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.