As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX: ESCAPE SLIDE TO FULLY INFLATE DURING DEPLOYMENT TEST DURING ROUTINE SHOP VISIT. THE ASPIRATOR VALVE FAILED BECAUSE IT WAS COVERED WITH DUCT TAPE. WHEN THE TAPE WAS REMOVED THE VALVE WORKED NORMALLY. SLIDE SCHEDULED MAINTENANCE WAS PERFORMED AND TESTED AND THE SLIDE WAS REPACKED. THE AIR CARRIER THAT LAST REPACKED THE SLIDE WAS NOTIFIED OF THE DISCREPANCY. THE SLIDE WAS RETURNED TO SERVICE.