B737 RETURNS TO DEP STATION WITH CARGO DOOR OPEN INDICATION DUE TO FAULTY CLOSING. DEPARTS AGAIN WITHOUT REQUIRED MAINT INSPECTION.

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FLT AIR INTERRUPTED DUE TO ILLUMINATION OF CARGO DOOR OPEN LIGHT AND SUBSEQUENT FAILURE TO PRESSURIZE. FLT DID NOT CONTACT DISPATCHER. FIRST INDICATION OF EVENT WAS WHEN XXX OPS CALLED TO REQUEST A NEW FLT PLAN. I REDISPATCHED THE FLT WHILE WAITING FOR THE CAPT TO CALL AND EXPLAIN THE SIT. WHEN CAPT DID NOT CALL; I INITIATED CONTACT THROUGH XXX OPS VIA TELEPHONE. I CONFIRMED QRH COMPLIANCE BY THE CREW; THAT THE FLT LANDED UNDER THE MAX LNDG WT RESTRS; AND ASCERTAINED THAT AN EMER HAD NOT BEEN DECLARED. I THEN CONFERENCED THE CAPT AND MAINT CTL. THE CAPT EXPLAINED HOW THE RAMP AGENT HAD NOT PROPERLY SECURED THE BIN WEBBING; WHICH BECAME LODGED IN THE CARGO DOOR SEAL. THE CAPT ASKED MAINT CTL IF WE NEEDED TO 'CALL OUT CONTRACT MAINT.' MAINT CTLR SAID NO. SINCE THE AIR INTERRUPTION WAS A HUMAN FACTORS INDUCED EVENT; I CONCURRED WITH THE CTLR'S DECISION. I REFILED THE FLT PLAN XXX-YYY AND REVIEWED FOM INCIDENT RPTING TO ENSURE COMPLIANCE. A FEW MINS LATER I RECEIVED A CALL FROM XXX OPS TELLING ME HE WAS UNABLE TO GET FLT TO RETURN TO THE GATE. I DID NOT REQUEST THIS ACTION SO AFTER QUESTIONING THE OPS AGENT; I DETERMINED THAT IT MUST HAVE BEEN MAINT CTL WHO INITIATED THE CALL. I CALLED THE -700 CTLR WHO CONFIRMED THAT HE REQUESTED THE FLT RETURN TO THE GATE FOR MECHANICAL INSPECTION. I INFORMED HIM THAT THE FLT WAS ALREADY AIRBORNE. SINCE THE CAUSE APPEARED TO BE HUMAN ERROR; THE FLT HAD NOT RPTED A REPEAT OF THE EARLIER PROBS AND MY PRIOR EXPERIENCE WITH SIMILAR EVENTS; I DECIDED THE FLT COULD CONTINUE SAFELY TO YYY AND I DID NOT CONTACT THE FLT TO RETURN TO XXX. AFTER THE FACT; I WAS INFORMED BY ANOTHER DISPATCHER THAT ALL FLTS THAT AIR INTERRUPT FOR MECHANICAL REASONS MUST HAVE AN INSPECTION PERFORMED. I WAS NOT AWARE OF THIS REQUIREMENT PRIOR TO THE EVENT; BUT I AM NOW SO INFORMED. ADDITIONAL FACTORS WHICH LED TO THIS POSTFLT EVENT WERE: 1) THE CAPT NOT CALLING DISPATCH IMMEDIATELY AFTER SAFELY RETURNING TO THE GATE. HAD HE DONE SO; THE -700 CTLR WOULD HAVE HAD AMPLE OPPORTUNITY TO REVISE HIS DECISION TO HAVE AN INSPECTION DONE PRIOR TO THE SECOND DEP. 2) MAINT CTLR NOT INITIATING HIS REQUEST THAT THE FLT RETURN TO THE GATE THROUGH DISPATCH. HAD HE DONE SO; I MIGHT HAVE BEEN ABLE TO CONTACT THE FLT PRIOR TO TKOF.