Take heart, the access to the VSVs and IGVs on the industrial LM2500s is much easier. Also the marine versions have a fuel control on the aft left hand side (ALF) of the AGB. The industrial turbines have a VSV control on the fwd R/H side of the AGB that is much easier to adjust.

I dont believe that the LM2500 has VBVs. Only the LM6000 and LM5000 have this arrangement since there is a Low Pressure Compressor forward of the HPC. During startup some of this compressed air is vented to atmosphere until the engine increases in power. This LPC acts similar to a supercharger.

The marine turbine enclosure is also so compact and tight it makes maintenance tasks inside the "box" difficult.

Good luck, and when you get out of the Navy there are lots of jobs in the cogeneration industry, IPP (Independent Power Producers), utility, etc. They are screaming for GSEs and GSMs.

Jack Kelly
(former GE Field Service Rep)
(former USN MM3)