I haven't researched this
EgyptAir Flight 990 10-13-1999
AAB-02-01
PB2002-910401
160 pages here is the link, happy reading:
http://www.ntsb.gov/publictn/2002/AAB0201.pdf
but the Egyptair B767 (MS999?) was deliberately flown into the sea, didn't the first officer have some gripe against the company
As I said:
Nevertheless, in most cases I am aware of, this evidence and conclusion (crew financial hardship/worries) was hotly contested by others directly working the investigation as well as other parties involved in the accident.