Actually two 737's had their center fuel tanks go boom without any apparent cause. One was flown by Philippine Airlines and the other by Thai Airways International. The 737's center fuel tank design is almost identical to the 747's except in size. Of course the design in all Boeing aircraft has been changed since TWA800 and older aircraft were either retired or modified during D-Checks.
Note: Initial reports on the TAI aircraft said it was a bomb due to the fact the Prime Minister was to be on board and initial field tests said they found traces of C-4. However, later tests showed there was not any C-4 involved.
Hmmmmm.