Over the last couple of days we replaced the gate on the M9BV5 valve. The 
old one had worn the teflon sliders on the sides. Metal shavings on bottom 
of body. Found a replacement with metal rollers, rather than slides. 
Pumped out downstream of gate valve. It's down to 5E-7 (moved the cable on 
the ion gauge so it now reads.)
Started cooling down the solenoid. Charging through the adsorber. LN2 fill 
piping broke. Repaired by resoldering. 
Ion gauge on solenoid seems to have burnt out last night.