The first thing I would do is make sure you have the latest connector pack from the Customer Portal or this page:
SolarWinds Knowledge Base :: How to apply a LEM connector update package
It's possible that there is a new revision of an existing Juniper connector or a new connector that will match the log data that the LEM is receiving.
Barring that, if you run an EXPORTSYSLOG and send the samples in the Solarwinds Helpdesk, they can test the data against all tools and, if needed, assist with a new connector request for PulseSecure.