HELP: Unintentional audio keyframing

Hi,
I'm not sure how else to describe the problem aside from unintentional audio keyframing, but not that is visible in any individual audio tracks.
Here's what's happening.
I have a single video clip of someone entering a car. when he's in the car and the door shuts, I have key framed 3 of the audio tracks to drop from +10 to -10 decibels to simulate the effect of the closed door.
the three audio tracks are car alarms going on outside.
everything was fine until some point last night I think I hit a combination of keys that have somehow linked these audio tracks and changed their levels, because shortly after the actor closes the car door and starts speaking, the car alarm volumes get louder.
no keyframes or level changes are visible in the individual tracks, and when I play them individually there is not a problem.
furthermore, I rebuilt the entire three audio track sequence from scratch and re-keyframed everything, and when I play it back the proble occurs. if i turn off the vocal tracks and just play the alarms there is no problem, so it kind of comes and goes.
last thing, around the time that this happened there was a horizontal red line across the hash marks of the timeline - i have never seen this before.
did i somehow link a whole cluster of clips to an unintentional audio shift? i've got a pretty good handle on this software but I am baffled. (i even exported a movie of the subject sequence and the problem exists in the mov file too.)
Help please.
Turner

I've tried that - thanks. Re-rendering made no difference. I can see keyframes in other clips - with this situation there is absolutely no obvious reason why the volume level changes so dramatically.
I ended up rebuilding the whole audio sequence again from scratch on different tracks and it's OK now. I did a work-around.
T

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