Got around to factory resetting it. Took about 2 hours last night. Had to re-root phone. Used techdad378's method for that. Restored around 50 apps from Titanium Backup, so at least I didn't have to reprogram the passwords for the streaming apps. {Reset system setting from notes instead of just restoring them. <--- That's what most ROM devs would recommend when restoring your device.}
While this was going on I used my older LG Optimus V as a phone. It's easy to program the ESID through VMUSA's web site. When my Event was reactivated, the PRL and phone profile settings were automatically updated. The firmware was already updated, so nothing happened on that end.
Doing this freed up about 238 MB of cruft from internal storage! Restoring didn't change the egl fix, so the phone is running on the hardware video drivers, YES!
If you're interested in unrooting the Event, this is the easiest way to do it.
If you do want to unroot, make a backup using the MyBackup app BEFORE factory resetting. Titanium doesn't work to restore apps in unrooted phones. You might want to backup your SD card, then reformat/repartition it from a PC (using FAT32). Then gradually add your photos and music while restoring... this is why I took a couple of hours, just to make sure most things were working. Resetting isn't something that can be done too quickly, but is worth it if you're getting too many error messages.