FLC OF AN LTT OPERATED ACFT WITH AN IMPROPER ACFT LOG RECORD SIGNOFF. PROC CONTRARY TO COMPANY PROC AND MEL PROVISIONS.

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ACR FLT FROM SFO-FAT HAD A CABIN DOOR LIGHT ILLUMINATE WHILE CLBING THROUGH 12000 FT MSL. I INSPECTED THE MAIN CABIN DOOR AND FOUND ALL THE ALIGNMENT MARKERS IN THE CLOSED POS AS WELL AS THE DOOR HANDLE IN THE CLOSED DETENT POS. I FOLLOWED THE PROCS IN THE QUICK REF HANDBOOK AND DIVERTED TO MOD. UPON LNDG; I OPENED AND CLOSED THE DOOR SEVERAL TIMES AND NOTICED IT OPERATED NORMALLY AND THE CABIN DOOR LIGHT EXTINGUISHED AS NORMAL EACH TIME. I TELEPHONED ACR DISPATCH AND INFORMED THEM OF WHAT HAPPENED; WHERE IN TURN THEY TRANSFERRED ME TO MAINT CTL. I CONFERRED WITH THE MAINT CTLR AND HE DIRECTED ME ON WHAT SHOULD BE ENTERED IN THE DISCREPANCY AND CORRECTION ACTION SECTIONS OF THE MAINT LOG. UNDER DISCREPANCY I ENTERED 'CABIN DOOR LIGHT ILLUMINATED INFLT.' UNDER THE CORRECTIVE ACTION SECTION THE MAINT CTLR DIRECTED ME TO ENTER 'OPENED AND CLOSED DOOR ALL ALIGNMENT INDICATORS AND HANDLE INDICATE SHUT-LIGHT EXTINGUISHED. OPS CHK OK;' FOLLOWED BY THE MAINT CTLR'S NAME AND A&P NUMBER; THE DATE; TIME AND STATION AS WELL AS MY SIGNATURE AND ATP NUMBER. UPON RETURNING TO FAT; I WROTE AN IRREGULARITY RPT AND GAVE IT TO THE CHIEF PLT. 2 DAYS LATER I WAS INFORMED BY THE CHIEF PLT THAT THE CORRECTIVE ACTION SIGNOFF IN THE LOGBOOK WAS NOT IN COMPLIANCE WITH REGS. PLTS ARE NOT ABLE TO PERFORM INSPECTIONS. THE CHIEF PLT INFORMED ME THAT HE HAD MADE A DISCLOSURE TO THE FAA AND ALSO THAT THE CABIN DOOR LIGHT SHOULD HAVE BEEN DME'ED BEFORE CONTINUING TO FAT. ALL PARTIES INVOLVED HAVE BEEN INFORMED.