https://www.defenceconnect.com.au/strike-air-combat/5519-cracks-appearing-on-new-f-35as-due-to-gun-use
Cracks appearing on new F-35As due to gun use
The Pentagon has issued a restriction order for Lot 9 and newer Lockheed Martin F-35A Joint Strike Fighters after the discovery of cracks in the aircraft’s stealth coating following use of the 25mm gun.