What was found
AFTER T/O RWY 27 RAISING THE LANDING G. HANDLE, ABNORMAL INDICATIONS, THE 2 MAIN GEAR GREEN LIGHT (DN) REMAIN ON. THE NOSE DID COME UP. SEVERAL AMBER CAS MESSAGES ILLUMINATED, INCLUDING THE WOW MISCOMPARE. PROCEEDED TO THE QRH DECIDED TO DECLARE AN EMERGENCY ON THE EVENT OF THE POSSIBILITY ACCORDING TO THE QRH OF NOT HAVING ANTISKID,REVERSES, STEERING. LANDED BACK IN KSAN WITH NO FURTHER INCIDENTS.