A CL65 DECLARED AN EMER AND DIVERTED DUE TO STABILIZER TRIM AND RUDDER TRIM FAILURE. ON DSCNT INCURRED ALT DEV DUE TO STABILIZER TRIM FAILURE.

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WE WERE AN EMER ACFT DUE TO RUDDER AND STABILIZER TRIM PROBS. WE WERE GIVEN CLRNC TO FL240 DIVERTING TO ZZZ1. AT APPROX FL245; CTR ADVISED US OF TFC AT OUR 10 O'CLOCK POSITION AND FIVE MILES. OUR ATTENTION WAS DIVERTED OUTSIDE THE COCKPIT; AND THE AUTOPLT WAS UNABLE TO LEVEL OFF AT FL240 DUE TO STABILIZER PROBS THAT WE WERE HAVING. THE ACFT DSNDED TO FL236; THE AUTOPLT WAS DISCONNECTED AND HAND FLOWN BACK TO FL240 WITH EXCESSIVE PITCH FORCE DUE TO THE STABILIZER PROB. CTR QUERIED OUR ALT; AND WE RPTED LEVEL AT FL240. AT THE TIME OF QUERY; WE WERE BACK LEVEL AT FL240. WE DID RECEIVE A TCAS TA. FLT CONTINUED WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THIS ACFT HAD A FIVE MONTH MAINT HISTORY ON RUDDER TRIM MALFUNCTIONS. AT FL310; THE RPTR SAID THE STABILIZER TRIM FAILED AND REQUIRED HEAVY INPUT TO THE ELEVATORS TO CHANGE PITCH ATTITUDE RESULTING IN AN ALT DEVIATION. THE RPTR STATED WHEN ON THE GND; THE AIRPLANE WAS TAKEN OUT OF SVC AND THE STABILIZER WAS RESET; BUT THE RUDDER TRIM REQUIRED A RUDDER TRIM MOTOR; ELECTRICAL WIRING REPAIR; AND CONNECTOR.