What was found
DURING INITIAL MLG RETRACTION, CREW HEARD A WHINING NOISE FROM REAR OF ACFT & GOT A RED MLG DISAGREE CAS MESSAGE & 3 YELLOW CAS MESSAGES,: HYD PRESS LO, BRK FAIL, & PUSHER FAIL. NOTED ON SYS SYNOPTIC PAGE, HYD PRESS INDICATING 0. RAN MLG DISAGREE QRH & CAS EXTING WHEN MLG LEVER DOWN. RAN APPR QRH CHKLISTS, DIVERTED, USED EMER BRAKING. POST FLT INSP, COULDN`T FIND IND OF HYD LEAK, NEITHER DPI POPPED, & HYD RES SHOWED NORM QTY. AFTER STOPPING, SHUTDOWN ENGS, INSPECT ACFT FOR HOT BRAKES, & DID NOT RETRACT FLAPS. FLAPS STILL IN FULL POSITION. INSPECT LT & RT HYD EDPS IAW EMM 05-50-00-210-822. REMOVED ENGS & FIRE CONTROL PANEL. INSTALLED A REPAIRED ENG & FIRE CONTROL PANEL IAW AMM 26-21-02. OPS CHKD GOOD.