A CESSNA CITATION 500; IMMEDIATELY AFTER TKOF AT 2000 FT; DIVERTED DUE TO THE L WING BEING HVY. CAUSED BY THE AILERON TRIM OUT OF RIG.

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ME AND MY FO PICKED UP OUR CITATION FROM ZZZ ON OUR WAY BACK TO ZZZ1. WE PREFLTED THE AIRPLANE. ON OUR START PROC; WE FOUND THAT OUR RADIO PANEL WAS OPEN AND HANGING LOOSE. WE CALLED OUT THE MECHS. THEY FIXED IT AND WE WERE ON OUR WAY. ALL CHKLISTS WERE DONE. FLT CTLS WERE CHKED. ON TKOF AFTER ROTATION; I FELT THAT MY L WING WAS EXTREMELY HVY. I HELD OPPOSITE PRESSURE AND KEPT CLBING TO HAVE SOME SAFE ALT BEFORE I STARTED ANY CHKLIST PROCS. TWR WANTED ME TO TURN R; SO I TOLD HIM THAT I HAD A FLT CTL SIT AND IT WAS HARD FOR ME TO TURN R. BUT I TOLD THE TWR THAT I WOULD KEEP A STANDARD RATE TURN AND LAND BACK. AS SOON AS I GOT ON THE DOWNWIND; I WENT AND STARTED THE CHKLIST WITH MY FO. WE FOUND THAT THE TRIM WAS NOT RIGHT ON TKOF. WE HAD THE AILERON TRIM TRIMMED TO THE NEUTRAL POS AS PER THE MARK; BUT AFTER WE MOVED IT; THE AIRPLANE STARTED REACTING BETTER AND WE LOST OUR PRESSURE ON L WING. SO I TOLD TWR THAT WE HAD THE SIT RESOLVED. WE CAME BACK HOME. APPARENTLY THE TRIM MARK WAS FOUND TO BE MOVED FROM ITS ORIGINAL POS DURING THE MAINT ON THE GND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE WAS IN THE CONTRACT MAINT FACILITY FOR MINOR ROUTINE WORK; INST CHKS; BATTERY REPLACEMENT AND ROUTINE SVC. THE RPTR SAID THERE WAS NO LOGBOOK RPTS ON ANY FLT CTLS. THE RPTR STATED THE AILERON TRIM WAS FOUND COMPLETELY OUT OF RIG AND NO ONE COULD ACCOUNT FOR THIS DISCREPANCY.