My left pedal (non drive side) has developed an annoying creak when I push the pedal down. I checked the crank bolts for tightness without success. I fit a different pedal, still creaking. The bottom bracket has no play in it and runs freely. I am confident that the noise is not transmitted from the seat post or saddle area and I am at a loss what (if anything) to check next before I replace the bottom bracket. I would welcome any suggestions. One thing I have discovered over the last few days is that your never alone with a creaky pedal.