My partner and I were flying CDG-MSP (DL139) in D1 on August 27th. After boarding somebody noticed a dent in the plane and they couldn't figure out where it came from. We sat on the plane for about 4 hours with progressive delays before they cancelled it.
Rebooking process was hectic but ultimately they got in under control and put us up in the Courtyard for the night and scheduled a rescue flight (DL 9913) for the following day. Turns out they were able to repair the dent overnight and we boarded the same aircraft the next day.

After arrival we proactively received $250 travel credit vouchers each. I also sent in a complaint with the attached EU261 form requesting 600 euro compensation each. Is this the correct avenue for this request?

Additionally, my fiancé also received 25k SkyMiles as well since one of the FAs spilled a tray of mimosas on her during boarding which they did via the tablet on the plane.