/etc/cron.d/maas-import-pxe-files is in maas-cluster-controller 1.2+bzr1373+dfsg-0ubuntu1~12.04.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Runs the MAAS image downloads early every Sunday.
11 4 * * 0 root /usr/sbin/maas-import-pxe-files &> /dev/null
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