AN ACR E120 FLC NOTICES THAT MAINT PERSONNEL DID NOT CLOSE A GEAR DOOR AFTER COMPLETING HYD SVC; BUT THEY DID NOT NOTICE THAT A FUSELAGE ACCESS PANEL HAD ALSO BEEN LEFT OPEN AND THE HYD SHUTOFF VALVE WAS STILL CLOSED.

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ON OUR INBOUND LEG WE HAD A COUPLE OF MAINT SQUAWKS WHICH INCLUDED HYD SVC AND A PROB WITH OUR CABIN PA SYS. I RETURNED TO THE ACFT WITH MY OUTBOUND PAPERWORK AND NOTICED THAT WE WERE STILL BEING WORKED ON. AFTER SOME TIME THE MECH RPTED TO ME THAT HE WAS FINISHED EXCEPT FOR THE HYD SVC. THE WX AT THIS TIME WAS HVY RAIN AND LIGHTNING IN THE AREA WITH 15-20 KT WINDS OUT OF THE E. AS THE MECH FINISHED HYD SVC I WALKED TO THE NACELLE TO INSURE THAT HE HAD CLOSED THE HYD BAY DOOR. AS I WALKED BACK AROUND TO THE FRONT OF THE ACFT I NOTICED A GEAR DOOR HANGING DOWN SO I TURNED ON A HYD PUMP IN THE COCKPIT TO CLOSE IT. ON TKOF IN HVY RAIN AND MODERATE TURB; WE RAISED THE LNDG GEAR AND COULD HEAR THAT ONE OR MORE OF OUR GEAR DOORS DID NOT RETRACT SO WE PUT THE GEAR DOWN AND REQUESTED TO RETURN TO THE ARPT. ALSO ON TKOF WE RECEIVED AUTOPLT TRIM FAILURE AND THE CABIN PA SYS BEGAN TO MALFUNCTION WITH MULTIPLE BELLS HEARD IN THE CABIN AND COCKPIT. WHEN WE REQUESTED OUR RETURN TO THE ARPT WE WERE ADVISED BY ATC THAT THERE WAS RPTED WINDSHEAR ON FINAL (+20 KTS). WE THEN ELECTED TO DIVERT TO CHA WHERE THE WX WAS MUCH BETTER (1O MI VISIBILITY; CALM WINDS). AFTER LNDG AT CHA I WALKED AROUND THE ACFT AND NOTICED THAT A FUSELAGE ACCESS PANEL WAS OPEN AND A HYD SAFETY VALVE FOR THE GEAR DOORS WAS LEFT IN THE LOCKED POS. HAD THE WX BEEN BETTER WITHOUT THE HVY RAIN AND WIND BLOWING AGAINST THE ACFT I THINK THAT THE OPEN DOOR WOULD HAVE BEEN MORE NOTICEABLE TO ME OR ANOTHER ACFT ON TAXI OUT. AFTER CHANGING ACFT WE DEPARTED FROM CHA TO TRI WITH NO FURTHER PROBS. SUPPLEMENTAL INFO FROM ACN 384169: WE DEPARTED AFTER 30 MINS OF TAXI AND STARTED TO CLB OUT AND AT 1500 FT AGL WE RAISED THE LNDG GEAR AND HEARD SOME UNUSUAL NOISE. THE CAPT RECYCLED THE GEAR WITH THE SAME RESULTS AS BEFORE. AFTER WE LANDED; WE NOTICED THAT THE FUSELAGE ACCESS PANEL WAS OPEN AND THE HYD SAFETY VALVE WAS IN THE LOCKED POS.