To view the backlog and get an idea which SLP has the the backlog you can use "nbstlutil report" from a command line. You have not mentioned whether you are on Linux or windows. For Linux the command is /etc/openv/nettbackup/bin. For windows it is located <INSTALL_DRIVE>\Program Files\Veritas\NetBackup\bin.
You could use something like the following to find a list of incomplete images:
"nbstlutillist -image_incomplete |findstr /C:"V7.6.0 C" >C:\temp\image_incomplete_Copy.txt" obviously this is a windows syntax command for Linux the grep command will need to used. My linux is rusty but something along the lines "nbstlutillist -image_incomplete |grep "V7.6.0 C" >/tmp/image_incomplete_Copy.txt"
I am sure one of the gurus here on the forum will correct any silly mistake.