Ya got me, I'm not sure why so many are running from this "Apache piped-log rotator processes" description.
Never heard of it.
Stop apache and examine? Busy = Money.
if not,
Code:
lsof -p 1472 | less
lsof -p 1473 | less
will show you details of those 2 Process Identifiers.
/var/log/apache2/access_log could be "in use" by something besides apache2...
Code:
lsof +D /var/log/apache2/
will show what's using what where, if anything.
Hope that helps.