What was found
(CAN) FLIGHT ABORTED - LOSS OF AHRS NR 2 INFORMATION ON CLIMB. FLT IB 8712 MAD/LYS CLIMBING TO FL 350: FOLLOWING EICAS/PFD MESSAGES APPEARED: PITCH FEEL FAULT (STATUS) YD 2 INOP (STATUS) PFD: FD-ATT-MAG RED FLAG NR 2 MFD: MAG RED FLAG NR 2 A/P DISCONNECT ATTITUDE, FD, MAG IN RED. C/B ATT HDG NR 2 CBP-2 K4 POPPED OUT. RESET ONCE = SAME. FLIGHT ABORTED, RETURN TO ORIGIN AIRPORT. MX REPLACED AHRU NR 2, AHRU 622-9336-400 27JNB U/S NOT KNOWN/INTERNAL.