Scheduled Downtime Problem - OpManager 7025

Hi,
I have a problem with OpManager 7.

I had a scheduled weekly downtime window, which automatically disabled management of a few hosts during a scheduled reboot. It worked fine for a while, automatically re-managing the devices at the end of the window.

A few weeks ago I was doing some unscheduled work, so put a temporary downtime schedule in place to stop alerting. I then made the mistake of deleting the enabled schedule, before it had completed and re-enabled all the devices. The affected devices stuck in un-managed mode and I had to go re-enable them all manually.

Unfortunately this has also broken the weekly downtime schedule - machines are automatically disabled for the window, but are not re-enabled, leaving my devices unmanaged until I come in on Monday morning and re-enable them manually.

Can you please tell me how to reset ALL downtime schedules, removing all scheduled downtime so I can start again?

Thanks,
Alistair