I filled out a support case online 11/27 I had not heard back so this morning I called in to support.
I fell into the installers trap so I called the main number back selected sales then the operator.
I told them I was the owner and the installer that their system would not let me get to support. I told them I had a case number.
She said she would just transfer me straight to support.
I waited maybe 15 min. the support guy was great he looked at the inverted that was underperforming by around 20% saw my install did not have shading that would cause this.
He said he would issue a RMA they even just mailed me a prepaid label to send the bad one back. I have a spare micro inverter on hand so now I will install it and keep the replacement for a spare.
I made him aware of their system would not let me get to them directly.
It would not let me get a RMA through their service web site.
https://service.enphaseenergy.com/
He said he would talk to the developer about these issues but who knows
My email from Enphase
"Enphase Warranty Claim - Approval to return"
I received this email a couple hours after the support call.