What was found
(CAN) BA SER CASE : 43929 SER - ATC COMPLAINED THAT XPDR WAS GIVING FL550 INSTEAD OF FL390 O CREW:XNDR#2 FAIL, ATC COMPLAINED THAT XPDR WAS GIVING FL550 INSTEAD OF FL390 - AFTER FULL POWER RESET-XPDR OPS TESTED-OK (TC# 20190411003)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) BA SER CASE : 43929 SER - ATC COMPLAINED THAT XPDR WAS GIVING FL550 INSTEAD OF FL390 O CREW:XNDR#2 FAIL, ATC COMPLAINED THAT XPDR WAS GIVING FL550 INSTEAD OF FL390 - AFTER FULL POWER RESET-XPDR OPS TESTED-OK (TC# 20190411003)