Your request in parentheses sounds a lot like Phantom Load by lovesrain44 (http://lovesrain44.livejournal.com/9737.html).
There are a few differences; it's Dean instead of Sam, the janitor instead of the principal, and the fic is told in present day when the guys are investigating and there are flashbacks to '92 when Dean first went through everything. The other details you had fit.
Author's Description: Dean and Sam return to Boulder, CO, where they investigate a haunted school. The job seems simple enough to Sam, who has good, although vague, memories of living in Boulder back in 1992, when John Winchester rented a single-wide trailer, and the boys were able to walk home from school together. Dean, however, has altogether different memories, far less pleasant and far more damaging. It's during the investigation that Sam discovers the secret that Dean doesn't realize he's been hiding.
It's a great fic and worth the read even if it isn't the one you're looking for.
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Date: 2012-01-03 12:44 am (UTC)There are a few differences; it's Dean instead of Sam, the janitor instead of the principal, and the fic is told in present day when the guys are investigating and there are flashbacks to '92 when Dean first went through everything. The other details you had fit.
Author's Description: Dean and Sam return to Boulder, CO, where they investigate a haunted school. The job seems simple enough to Sam, who has good, although vague, memories of living in Boulder back in 1992, when John Winchester rented a single-wide trailer, and the boys were able to walk home from school together. Dean, however, has altogether different memories, far less pleasant and far more damaging. It's during the investigation that Sam discovers the secret that Dean doesn't realize he's been hiding.
It's a great fic and worth the read even if it isn't the one you're looking for.