TOKYO - Japan's All Nippon Airways has reported two new cases of problems with its Boeing 787 Dreamliners.

ANA spokeswoman Ayumi Kunimatsu said Friday a very small amount of oil was discovered leaking from the left engine of a 787 flight from southern Japan's Miyazaki airport to Tokyo. The jet returned to Miyazaki, but after checks found no safety risk it flew to Tokyo.

ANA said on another flight, to Matsuyama on Shikoku island, glass in a cockpit window cracked and the aircraft was grounded for repairs.

The airline cancelled a domestic flight to Tokyo on Wednesday after a computer wrongly indicated a problem with the 787's brakes.

Boeing has insisted that problems with the 787 are no worse than what it experienced when its 777 was new in the mid-1990s.

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  • The interior of the new Boeing 787 Dreamliner aircraft control room is shown, after the plane arrived at O'Hare international Airport in Chicago, Sunday, Nov. 4, 2012. (AP Photo/Nam Y. Huh)

  • United CEO Jeff Smisek, left, looks outside after United's inaugural revenue flight of its Boeing 787 Dreamliner arrived at O'Hare international Airport in Chicago, Sunday, Nov. 4, 2012. (AP Photo/Nam Y. Huh)

  • An upgraded video screen on the back of a seat of United Airlines' new Boeing 787 Dreamliner is shown after the aircraft's inaugural revenue flight from Houston to Chicago, at O'Hare international Airport in Chicago, Sunday, Nov. 4, 2012. (AP Photo/Nam Y. Huh)

  • The interior of United Airlines' new Boeing 787 Dreamliner is shown after its inaugural revenue flight from Houston to Chicago, at O'Hare international Airport in Chicago, Sunday, Nov. 4, 2012. (AP Photo/Nam Y. Huh)

  • A United Airlines 787 Dreamliner arrives at O'Hare international Airport. (AP Photo/Nam Y. Huh)

  • (AP Photo/Nam Y. Huh)

  • Onboard United's Inaugural 787 Flight

    Pan over the cabins on United's inaugural 787 flight from Houston to Chicago