There’s been a cumulative patch release for NetWorker 7.6. This isn’t a service pack, but a bunch of patches on top of the vanilla 7.6 implementation. (To be more accurate, this happened last week, but I was on holiday and didn’t get around to retrieving it until now.)
There’s only a few fixes in it, but it seems to be recommended for servers and storage nodes running 7.6.
I’m currently running some tests against it and not having any issues as yet. If you’re after the cumulative patch details or a download link, please contact your EMC NetWorker support provider.