A Coast Guard C-27J Spartan crew, assigned to Coast Guard Air Station Sacramento, flies over San Francisco, California, during area of responsibility familiarization training, Monday, Feb. 6, 2018. The C-27Js are outfitted with weather radar and communications equipment capable of supporting transport and other Coast Guard missions. Coast Guard photo by Lt. Scott Handlin
“Structural cracking has forced the U.S. Coast Guard to ground its entire fleet of 14 C-27J Spartan maritime patrol aircraft…”
Chuck Hill's CG Blog 
CG aircraft still grounded. Most other operators have returned to service. https://www.defensenews.com/air/2023/12/22/us-coast-guard-keeps-its-c-27js-grounded/