F100 CREW; AFTER TKOF; FOUND THEY HAD ALMOST NO ELEVATOR PITCH CTL OF THE ACFT IN CE90 CLASS B.

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AFTER ROTATION; THE ELEVATOR BECAME ALMOST UNRESPONSIVE. I COULD GET COME MOVEMENT BY PULLING OR PUSHING WITH BOTH HANDS EXERTING 50-80 LBS OF PRESSURE. PERFORMED SOME TROUBLESHOOTING; IE; CIRCUIT BREAKERS IN; AND CHKING THAT HYD PRESSURE AND QUANTITY WERE OK. OPS MANUAL NO HELP. CALLED MAINT WHO HAD NO IDEAS. I DECLARED AN EMER AND RETURNED VIA ILS RWY 9R. STABILIZER TRIM WORKED FINE AND USED THAT FOR PITCH CTL DURING LNDG. LANDED WITH FLAPS 25 DEGS AND NO PROB. THERE WERE NO FAULTS INDICATED. TKOF CONFIGURATION CHK PRIOR TO TKOF; NORMAL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE ACFT WAS REMOVED FROM SVC AND GIVEN A MAINT INSPECTION. NOTHING WAS FOUND. THE ACFT WAS THEN SCHEDULED FOR FLT TEST. ON THE TEST FLT; THE SAME PROB REOCCURRED. THE FLT TEST CREW DECLARED AN EMER AND GOT THE ACFT BACK ON THE GND. AFTER 2 DAYS OF MAINT TROUBLESHOOTING; MAINT WAS STILL UNABLE TO DUPLICATE THE PROB. MAINT THEN REPLACED BOTH THE #1 AND #2 ELEVATOR HYD CTL UNITS AND ACTUATORS. THE ACFT WAS THEN SCHEDULED FOR A SECOND FLT TEST. THE PROB DID NOT REOCCUR. THE RPTR DOES NOT KNOW WHAT PROBS WERE FOUND WITH THE HYD ACTUATORS OR CTL UNITS. THE CAPT HAS 11 YRS EXPERIENCE ON THE ACFT AND IS NOT AWARE OF A SIMILAR INCIDENT. THE FLT CTL CHK BEFORE TKOF WAS NORMAL.