The plane maker said it was "working closely" with the US Federal Aviation Administration (FAA) and would direct clients on how to resolve the issue.
Boeing Co's 737 MAX plane restarted commercial flights in Brazil, the first country in the world to do so, 20 months after the aircraft was grounded worldwide by regulators following two deadly crashes.
Boeing 737 MAX planes in the United States were grounded after two crashes that killed a total of 346 people in 2018 and 2019.
Sensor failure and failure to provide pilots with information contributed to 2009 crash and last year's twin catastrophes.
Boeing Co fires CEO Dennis Muilenburg as the world's biggest planemaker seeks to control an escalating crisis that has seen it halt production of its best-selling 737 MAX jetliner following two fatal crashes.
Muilenburg said Boeing followed the same design and certification process it has always used and denied that the MAX was rushed to market. He said he would not resign, and left a press conference as reporters peppered him with questions.
Boeing has been under scrutiny following a March 10 Ethiopian Airlines crash of a 737 MAX that killed 157 people, the second deadly crash involving in the aircraft in five months.
"The reason is that Garuda passengers in Indonesia have lost trust and no longer have the confidence" in the plane, Garuda spokesman Ikhsan Rosan said.
The analysis is expected to help figure out why the Ethiopian Airlines aircraft plunged to the ground minutes after take-off last week, killing all 157 people on board.
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