What was found
LEVELING AT FL300 VTK DISPLAYED ON F/O ND, ACCOMPANIED BY LOSS OF FLIGHT DIRECTORS ON PFD, BEGAN QRH PROCEDURES AND SYSTEM RETURNED TO NORMAL OPERATION AFTER APPROX 30 SECONDS. GROUNDED - YES. FAULT LOGGED WAS 31-67440. NR 2 FMC NO DATA,( CDS-2 RECEIVE NO DATA FRON NR 2 FMC.)ACCOMPLISHED NR 2 FMC BITE PROCEDURES PER FIM 34-61 TASK 801 AND NO CURRENT FAULT, ALL OPS CK GOOD. CDS SYSTEM BITE PROCEDURES PER FIM 31-62 TASK 801,OPS CK GOOD. DFCS LRU INTERFACE TEST FOR CDS OPS CK GOOD REF MM 22-11-00, HGS SENSOR TEST FOR CDS OPS CK NORMAL. LLM STATUS REMAINS UPGRADED TO CAT III AUTOLAND AND HGS.