First and foremost, I'm sorry you've had such a rough time with your Solo. I've only had mine a couple of months and I haven't had any major problems that weren't easily remedied, but I'm sure it really sucks to have put so much time, energy, and resources into something to have it disappoint you that much.
You could try, but under CA lemon law the electronic device has to fall within 1 of 4 subdivisions of the Business and Professions code.
(h) “Electronic set” includes, but is not limited to, any television, radio, audio or video recorder or playback equipment, video camera, video game, video monitor, computer system, photocopier, or facsimile machine normally used or sold for personal, family, household, or home office use.
(i) “Appliance” or “major home appliance” includes, but is not limited to, any refrigerator, freezer, range, microwave oven, washer, dryer, dishwasher, trash compactor, or room air-conditioner normally used or sold for personal, family, household, or home office use, or for use in private motor vehicles.
(j) “Antenna” includes, but is not limited to, a resonant device designed especially for the purpose of capturing electromagnetic energy transmitted by direct satellite or commercial radio or television broadcasting facilities. An antenna and its associated accessories are not deemed to be a part of a set and shall be considered, under this section, to be located outside or in the attic of a residence.
(k) “Rotator,” when used in connection with an antenna installation or repair, includes, but is not limited to, an electromechanical device operated from a remote location to rotate an antenna on a horizontal plane. A rotator and its associated accessories are not deemed to be a part of a set and shall be considered under this section, with the exception of the directional control unit, to be located outside or in the attic of a residence.
The closest would be video camera, but that is a bit of a stretch since they didn't sell you a camera.
The Song-Beverly act also states that they shall make these parts available to repair and service shops (of which I'm guessing their are no authorized repair and service shops for 3DR Solos or the Gimbal), so they would likely argue that they wouldn't have to make them available to you.
I'm not a lawyer but I agree that you will probably struggle to find one willing to take your case.