While leak checking components in the M20 front end on May 25th, the top of the T2 monolith was also checked by flooding the top of the monolith with helium while it was covered with plastic sheeting.  There was no response on the Varian leak detector indicating no significant leaks from the flange seals, shaft seals, and seals for upper services on the T2 target, T2 protect monitor, M9BB, M20BB, and M8BB/Col.A