B737-200 CREW FOUND THE ACFT WOULD NOT PRESSURIZE.

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THE ACFT FAILED TO PRESSURIZE AFTER TKOF FROM SEA. FOUND PRESSURIZATION CIRCUIT BREAKERS PULLED AND COLLARED. FOG LAYER IN SEA PREVENTED A RETURN TO SEA DUE LOW VISIBILITY SO DIVERTED TO PDX IN ACCORDANCE WITH COMPANY REQUEST. THE ACFT HAD BEEN DOWN FOR MAINT FOR ABOUT 1 WK; WITH A PRESSURE BULKHEAD CRACK THAT REQUIRED REPAIR. THE ACFT HAD BEEN FERRIED UNPRESSURIZED FROM SEA TO ZZZ REPAIRED; THEN FLOWN BACK TO SEA. WE WERE THE FIRST SCHEDULED FLT AFTER THIS MAINT. THIS EVENT WAS PARTICULARLY FRUSTRATING FOR MYSELF AND MY FO FOR A COUPLE OF REASONS. WE HAD SPECIFICALLY DISCUSSED THE FACT THAT THE PLANE HAD BEEN DOWN FOR MAINT FOR SEVERAL DAYS; AND THAT WE SHOULD BE ON THE LOOKOUT FOR ANYTHING UNUSUAL DURING OUR PREFLT INSPECTION. WE ALLOWED EXTRA TIME FOR THE PREFLT BY SPLITTING THE DUTIES; WITH THE FO COMPLETING THE INTERIOR AND EXTERIOR PREFLT INSPECTIONS; AND MYSELF DOING THE COCKPIT AND MAINT LOGBOOK INSPECTIONS. IT IS FRUSTRATING TO ME THAT EVEN THOUGH WE TOOK THESE PRECAUTIONS; AND 'DID ALL THE RIGHT THINGS' FROM A CRM ASPECT; I STILL MISSED THE FACT THAT THE BREAKERS WERE IMPROPERLY COLLARED DURING THE COCKPIT INSPECTION. UPON INITIAL CLBOUT; IT WAS OBVIOUS THAT THE PRESSURIZATION WASN'T WORKING. ONCE WE FOUND THE PROB; THE SUBSEQUENT DIVERT AND OVERWT LNDG AT PDX WERE UNEVENTFUL. THE LESSON LEARNED HERE WAS TO BE SUSPICIOUS OF AN VERIFY AND COLLARED CIRCUIT BREAKERS THAT DO NOT HAVE THE TIE WRAPS; AND ALSO OF ANY COLLARED CIRCUIT BREAKERS THAT ARE IN A LOCATION ON THE CIRCUIT BREAKER PANELS WHERE WE DON'T NORMALLY SEE COLLARED BREAKERS. I BELIEVE THAT IF A LOGBOOK ENTRY HAD BEEN MADE RECORDING THE PRESSURIZATION SYS DEACTIVATION; THIS NEVER WOULD HAVE HAPPENED. MAINT WOULD HAVE TO RESET THE SYS TO CLR THE LOG PAGE; AND IF THEY DIDN'T I WOULD HAVE SEEN IN THE LOGBOOK THAT THE SYS HAD BEEN DEACTIVATED WHICH WOULD HAVE HELPED DRAW MY ATTN TO THE CIRCUIT BREAKERS FOR THE SYS. SUPPLEMENTAL INFO FROM ACN 633347: ATTEMPTED TO CTL WITH STANDBY MODE; MANUAL AC AND MANUAL DC MODES OF OP. ACFT WOULD NOT PRESSURIZE.