737 elevator was considered as a cause for crash before also.
For example, Flydubai Flight 981 (Report:
'Flydubai Flight 981 Crash')
Even though it was filed as pilot error, there is still a controversy because,
one dissenting commission member, a Rosaviatsiya representative, filed an alternative opinion report, claiming the commission ignored a possible mechanical malfunction of the Boeing 737's elevator controls.
As of now, the Interstate Aviation Committee has not released their final report of the crash.
Seems like there are some serious issued in elevator controls of 737's.