I think it would be to difficult to write a comprehensive health check tool, however, you could script your own tailord to your backup domain.
examples...
bperror -problems [options]
bpps -a - NBU and PBX running on NBU server?
cat /usr/ope...
About
BIOGRAPHY
former SYMC NBU Tech Support Eng.
CERTIFICATIONS
Symantec NetBackup 7.5 for Unix Administrator
SCS Symantec NetBackup 7.5 for Unix Administrator