B737-200 CREW WAS UNABLE TO PRESSURIZE THE ACFT WITH THE ENG PNEUMATIC SYS. THEY THEN HAD CABIN SMOKE AND ELECTRICAL FUMES IN THE CABIN.

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UNABLE TO PRESSURIZE CABIN WITH ENG BLEEDS DURING CLB. LEVELED AT 10000 FT; ON COURSE FROM IND TO ZZZ; FO; WITH APU BLEED MAINTAINING PRESSURIZATION. DECIDED TO DIVERT TO SDF. ON DSCNT; CABIN RPT SMOKE (ELECTRICAL SMELL) MID CABIN. DONNED OXYGEN MASKS AND GOGGLES. HAD CHK AIRMAN IN JUMP SEAT PERFORM EMER CHKLIST WHILE I (PF) FLEW VECTOR TO ILS APCH. I NOTED THAT AIR CONDITIONING DUCT TEMP 30 DEGS C AND SHUT DOWN BOTH AIR CONDITIONING PACKS BELOW 5000 FT. ADVISED ATC OF OVERWT LNDG (+10000 LBS IN FUEL) AND SMOKE SIT. THEY GOT ALL THE CFR OUT IN MINS BEFORE TOUCHDOWN. TOUCHDOWN WAS SMOOTH AND UNEVENTFUL. AFTER ROLLOUT; I CHKED WITH CABIN -- OTHER THAN HOT; SMOKE HEAD CEASED. TAXI TO GATE AND DEPLANED. MAINT FOUND AN AIR CONDITIONING PACK ELECTRONIC CTL BOX IN THE E&E COMPARTMENT HAD BECOME 'UNRACKED' -- LOOSE! THEY REINSERTED AND SYS CHKED GOOD. MAINT STATED THAT NO WORK HAD BEEN PERFORMED RECENTLY IN THE E&E COMPARTMENT. ONLY ACCESS I'M AWARE OF WAS PREVIOUS WK WHEN CLRING CUSTOMS. UPON RETURN TO ACFT FROM CUSTOMS; I FOUND THE E&E COMPARTMENT HATCH (BEHIND NOSE GEAR) OPEN. ASSUMED THAT CUSTOMS HAD OPENED FOR INSPECTION. SINCE WE'RE ON THE 'AOA' OF THE INTL RAMP AT IND; I DIDN'T THINK TOO MUCH OF IT. NOT SURE WHAT TO THINK NOW! WHILE IT IS A WRITTEN SOP TO CHK; THE E&E INTL FLTS; NO ONE DOES. WHILE THE PURPOSE IS FOR CONTRABAND; A THOROUGH PREFLT NEVER HURTS; EXCEPT FOR MAINTAINING SCHEDULE INTEGRITY. WONDER WHAT MY CHIEF PLT WOULD SAY WHEN I DEPART LATE BECAUSE I SPENT TIME IN THE E&E COMPARTMENT!