No idea what 'regular servicing' of the whole system is but to shutdown a V5 system you first need to backup the system.
EXE-UPDAT:BP,ALL;
EXE-UPDAT:A1,ALL;
DEA-DSSM:A1,1,J;
COPY-DDRSM:A1,1,E,1,J,N;
If you can take out a REGEN file all the better or back it up to a Compact Flash drive
COPY-DDRSM:A1,1,E&F,6,E&F,N;
Then to shut down the system you need to deactivate the hard disk to prevent damage.
DEA-DSSM:A1,1;
Then power down the system.