What was found
AIRCRAFT WAS GROUNDED: AIRCRAFT REPORTED DURING CLIMB WITH NO FAULT MESSAGES. AIRCRAFT SKIPPED FROM TAKE-OFF (CLIMB) MODE TO DESCENT MODE WHILE CLIMBING OUT OF MIA. DFDR DOWNLOAD EVALUATED BY ESC NO ABNORMALITIES OBSERVED PER ESC CHIEF DISPATCH FOUND NO ISSUES WITH FLIGHT PLAN. PER MOC NO HISTORY LIKE EVENTS FOR 30 DAYS PERFORMED OPERATIONAL TEST OF AUTO FLIGHT SYSTEM PER AMM 22-96-00, TEST PASSED. PER POST FLIGHT REPORT #1 DME MESSAGE, PERFORMED BITE OF DME SYSTEM PER AMM 34-57-00, NO FAULTS. PERFORMED BITE OF BOTH LRRA PER AMM 34-42-00, NO FAULTS. NOTED CREW REPORTED VERBALLY NO UN-COMMANDED DECENT, OK FOR SERVICE. ALSO PERFORMED TSM 34-42-00 LRRA POSSIBLE 5G INTERFERENCE, NO ISSUE FOUND.