I logged onto dishonline and did screen captures of the timer's that were in place when I upgraded from my 622 to 722. It would seem that from dishonline there would be the ability to "save" timers and export them to another dvr, but alas, there isn't.
From your post it sounds as if your hard drive has died; I'm not sure if the dishonline would help. I remember getting a 622 years ago (refurb) that came with a bad drive, and once it went through the boot, it would say the dvr was not functioning correctly and after pressing "OK" it would act like a multi tuner non DVR. I didn't try setting timers but perhaps they are stored in non volitile ram like on a 211 or other non DVR; when I say timer I mean 'tune to' or 'reminder' and not record. Hopefully you'll be able to get them.
Miner