If you have physical access to the machine, go to C:\program files\Cisco\bin\ and use adminutility tool to change the passphrase as well as other service accounts.
You may use C:\DCDsrvr\bin\ CCMPasswordchanger to change passwords for MLA. Also check this link.
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_configuration_example09186a00800942be.shtml
You can reset sa password from SQL enterprise manager.
HTH
Sankar
PS: please remember to rate posts!
Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus