Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Cadillac for this TSB. Call your local Cadillac dealer's service department & ask for a copy of TSB# 08-05-22-003A.
Affected Component: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
CADILLAC: HARD BRAKE PEDAL ON COLD START AT HIGH ALTITUDES (INSTALL AUXILIARY VACUUM PUMP). THIS CONDITION MAY BE CAUSED BY LOW ENGINE VACUUM DURING WARM UP. *PE