A:
Hello - this is Nancy at GE and I am happy to help you.
Yes, the PEB7226SFSS requires trim kit JX7230SFSS (for 30" cabinets). This trim kit requires the following cabinet cutout dimensions: Height 16-3/4" x Width 25-1/2" x Depth 19-1/2" or 22". Your current cutout dimensions appear to match this microwave and trim kit cutout requirements without any further adjustments.
I hope this helps! Thank you for checking with us!