GSS started task displays references to Release 14.00.00 ISRV subsystem after upgrading to Common Service release 15.0.
The FMID for GSS that comes with Common Service release 15.0 did not change so it is valid for GSS to display CCS Release 1500 and GSS release 14.00.00, for example:
SRV100 Version 14.00.00: Initialization Begins...
...
SRV221 Installed w/CCS Release 1500 (CAIRIM 1500F000AS900 )
...
SRV220 Release 14.00.00 BASE: Initialization Complete (ISRV)
GSS PTF's are published for Common Service release 15.0.