As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEG - ON TAXI FOR FLIGHT 4307, RECEIVED A RIGHT PACK CAUTION MESSAGE. RETURNED TO THE GATE. PLACED ON MEL 21-51-1(B) PLACARD 354278. RETURNED TO SERVICE. ON 2/11 PERFORMED OPERATIONAL TEST OF RT AIR CONDITIONING PACK. CHECKED NORMAL. NO MESSAGE OR DEFECTS NOTED. MEL CLEARED AND AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.