If I might ask (without going to the memo), how did they reset the FMGEC's and how did they know, procedurally, to do it?
FCOM Procedures 22-10
MANUAL FMGES RESET
MANUAL RESET OF FMGCS
On rare occasions, the FMGS may require manual resetting.
If this occurs in flight, reset one FMGC at a time.
The aircraft has two reset breakers per FMGC:
‐ The FM reset-breaker C/B resets the flight management part of the FMGC.
‐ The FMGEC reset-breaker C/B resets the flight management, flight guidance, and flight envelope parts.
Resetting the FM reset-breakers C/B or FMGEC reset-breakers C/B disconnects the onside autopilot.
The FM further resynchronizes to reset one or both FM.
Resetting the FM or FMGC reset-breaker does not increment the reset counter: There is no limitation to the number of reset-breaker resets.