What was found
FLT 562, FLL-SWF, AIR RETURN TO FLL, AIRFRAME VIBRATION AT 300-320 KIAS CLIMBING THROUGH FL230. VIBRATION FADED AS AIRCRAFT SLOWED BELOW 230 KTS. ENG AND FLIGHT CONTROLS INDICATED NORMAL. PERFORMED TSM TASK 05-50-00-810-801. PER CREW INPUT VIBRATION REPORTING SHEET DECISION TABLE FOLLOWING TASK PERFORMED. PERFORMED ELEVATOR PCU CHECK PER MM 27-34-00-200-001, MEASUREMENTS. LT INBD-5.5MM, LT OTBD 6MM, RT INBD, 2MM, RT OTBD 4MM. PERFORMED RUDDER PCU CHECK PER AMM 27-24-00-200-001, BLUE- 6MM, YELLOW- 6.5MM, GREEN 7MM, REPLACED LT OTBD BLUE SYSTEM ELEVATOR PCU 34CE3 DUE ROD END OUT OF LIMITS PER AMM 27-34-51-04, OPS AND LEAK CHECK OK.