The YBM turbo pump was vented with room air to facilitate the replacement of the bellows and 10" gate valve at its inlet (WP7180).  Following leak testing of these new joints, the turbo was left running while backed by its local scroll pump (10" valve closed, WP #7186).  The turbo inlet pressure achieved 1.0 x 10-8 torr (foreline 2.3 x 10-3 torr) after 15 hours.  As such, baking won't be necessary.  

I shut down the clean room, turbo and scroll pumps.  

This completes WP #7180 and WP #7186