Need help decoding flight plan.
 

Please have a look at the following flight plan. (Replaced some part of it with XXXX for security reason.)
I am quite familiar with flight plans for VFR flight training but not with something like below.

============================
DGA1087
FF RKSIZPZX RKRRZQZX RKJJZPZX RKSSZPZX RKTUZPZX RKPCZPZX RKPCZTZX
172359 KDENXLDS
(FPL-XXX123-IS
-B738/M-SDFGHIRWXY/S
-RKSI0320
-N0461F360 BOPT1K BOPTA Z51 BEDES Y711 SAMIS DCT CJU/N0461F350
Y579 ONC Y45 OKUMA OKUMAS
-ROAH0158 RKPC
-PBN/A1B1C1D1S1 DOF/150118 REG/XXXXXXX EET/RJJJ0048 SEL/HRFG
CODE/71C294 OPR/XXXXX AIR PER/C RMK/TCAS EQUIPPED
E/0406 P/TBN R/VE S/M J/LF D/0
A/WHITE
C/XXX YYY)
============================

Please decode the following parts please. :)
Many thanks!!!!


1)
DGA1087
FF RKSIZPZX RKRRZQZX RKJJZPZX RKSSZPZX RKTUZPZX RKPCZPZX RKPCZTZX
172359 KDENXLDS


2)
B738/M-SDFGHIRWXY/S


3)
PBN/A1B1C1D1S1


4)
EET/RJJJ0048


5)
SEL/HRFG


6)
CODE/71C294


7)
P/TBN R/VE S/M J/LF D/0

pretty standard ICAO

P/TBN -> Person on board, To Be Notified (not known at time submitted)
R/VE -> emergency Radio VHF and ELT
S/M -> Survival equipment Maritime
J/LF -> Life vests Light Fluorescent
D/0 -> Life raft none

appears to be a flight over water?