If the software is running on RHEL, you should talk to Red Hat. I'm pretty sure that customers with a RHEL support contract can get access to application support from Red Hat to debug issues on the OS.

I also know first hand from Red Hat employees that they have a dedicated infrastructure for testing just this kind of "weird issue only happens on $foo hardware" stuff.

And while i can't confirm this as directly, I'm quite sure their hardware testing pool will contain some hardware that can help with debugging an issue like this.