NEW YORK (CBSNewYork/AP) – There are more problems for Boeing and their embattled 737 planes.

The Federal Aviation Administration has ordered inspections of a 737 model after warnings of structural cracks in the aircraft.

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Boeing discovered cracks on a small number of planes that were undergoing maintenance in preparation for modifications. The company then notified the FAA.

The cracking was found in the plane’s pickle forks — which attach the body of the aircraft to its wings.

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Operators of certain “737 next generation” planes will be required to make inspections due to the discovery.

Boeing CEO Dennis Muilenburg has already agreed to testify before a congressional committee investigating the grounded 737 Max planes.

The company is working to fix flight-control software implicated in crashes off the coast of Indonesia and in Ethiopia and solve another problem that FAA test pilots discovered in the 737 Max in June.

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(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)