Forum Moderators: Robert Charlton & goodroi
Although, Matt Cutts made it clear this morning at PubCon that you can use a 301 even for a short "temporary" period, then change it back or redirect it elsewhere - just be rather free with it and not have problems with Google.
The reason I said use a 302 is that keeps the domain name alive in the index, where a 301 would not.
If you used the 503, you would, of course, lose traffic during your maintenance time, which might, in this situation, rule it out.
[edited by: Robert_Charlton at 6:30 pm (utc) on Dec. 16, 2007]