I agree with barit1
I have never seen or heard of a tail pipe fire happen on my company fleet who have been operating CF6-80s since 1989.
Last time I saw such an event was on a PW JT9D on shut down and the RB211 G can catch people out whom do igniter checks without doing a dry spin first to remove pooled fuel. It took 8 bolts to fix the defect last time it occurred