A B737-800 CONTRACT MAINT MECHANIC PULLED WRONG CIRCUIT BREAKERS INCLUDING BOTH FUEL LEVER CIRCUIT BREAKERS WHILE ATTEMPTING TO ACCOMPLISH MEL PROCEDURE. UNABLE TO START ENGINES AT PUSHBACK.

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UPON ARRIVING AT THE ACFT MAINT PERSON WAS COMPLETING AN MEL ON THE HUD FROM A PREVIOUS FLT. AFTER COMPLETE I CALLED ACR MAINT TO CLARIFY THAT IT WAS DONE CORRECTLY. I WAS BRIEFED BY BOTH THE CONTRACT MAINT TECH AND ACR MAINT THAT ALL WAS IN ORDER. AFTER PUSHBACK DURING #1 ENG START; NO LIGHT-OFF OCCURRED WHEN I PUT THE FUEL LEVER TO IDLE. I RAN THE QRH PROC AND REATTEMPTED THE START. AGAIN NO LIGHT-OFF. WE TOWED BACK TO THE GATE AFTER CHKING THAT ALL CIRCUIT BREAKERS WERE IN; WHICH THEY WERE. UPON CLOSER INSPECTION WE FOUND THAT THE CONTRACT MAINT TECH PULLED THE INCORRECT CIRCUIT BREAKERS. HE PULLED THE 4 CIRCUIT BREAKERS DIRECTLY BELOW THE CORRECT ONES; 2 BEING THE FUEL LEVER CIRCUIT BREAKERS. WE AGAIN CALLED OUT MAINT AND SHOWED HIM WHAT HE DID IN ERROR. MAINT REACCOMPLISHED THE MEL CORRECTLY UNDER SCRUTINY FROM BOTH ME AND MY FO. ACR MAINT WAS THEN CALLED AGAIN TO VERIFY ALL MAINT PROCS WERE DONE CORRECTLY. WE PERFORMED AN ENG RUN PER FOM PROCS AND CONFIRMED ALL MAINT PAPERWORK WAS IN ORDER. THE REST OF THE DAY WENT WITH NO FURTHER ISSUES. CONTRACT MAINT SHOULD THOROUGHLY BRIEF CREWS ON WHAT THEY ACCOMPLISHED SHOWING WHAT THEY ACTUALLY ACCOMPLISHED INCLUDING CIRCUIT BREAKERS PULLED AND PAPERWORK COMPLETED.