I don't do either of thoseGrease all of the things.
Does it squeak when you pedal standing up?
Does it squeak when you pedal sitting down, with no hands on the bars?
A loose nut on the rider?Got it! I hope, no, I'm sure! Not a chirp out of it on my test run.
I did many of the suggestions, lube seat post, pedal bearings,
tightened crank bolts, lubed everything that moves. Thanks for all
the help, I was just fixed on it being the bottom bracket and didn't
look further. Now I don't have to set it on fire! It came close to this.
View attachment 73292
Wow, not one correct response!. Replace your left Knee. You are old, like myself, thats what happens to us.
Also check your pedal bearings and and rear hub.