This is strange. SQL 2005 SP3 (build 4340). Full backup job and tran log backup job are separate maint plans/Agent jobs as opposed to multiple steps in one maint plan (don't ask me... I didn't set it up that way.)
I set a database XYZ offline last night at around 9pm. It was last backed up at 8pm (full recovery mode). My tran log backup started failing then. This morning, I detached the database. Tran log backup job still failing. I finally realized it had something to do with database XYZ so I re-attached it. Tran log backup working now. The weird thing is that XYZ had not been selected only specific databases, and the detached database isn't selected. I tried setting to simple recovery mode and doing a final full backup before detaching, but tran log job still fails. How can I get rid of database XYZ without the tran job failing? Thanks.