What was found
PDX FLIGHT NR 2078 SHORTLY AFTER ROTATION NR 1 ENGINE MANUAL CAUTION LIGHT ILLUMINATED ACCOMPANIED BY 10 PERCENT TORQUE INCREASE NR 1 ECU REMAINED ON WITH SELECTOR SET AT TOP. ALL ENGINE INSTRUMENTS OPERATED ACCURATELY. POWER LEVER SPLIT CONSISTENT WITH MANUAL MODE. INSPECTED AND FOUND BETA LOCKOUT SYSTEM ACTIVATED FOR NR 1 ENGINE DUE TO FAULTY POWER LEVER MICROSWITCH 6121-S11 SUPPLYING 28V TO PIN C1 OF RELAY 6141-K3. REPLACED AND ADJUSTED NR 1 POWER LEVER MICROSWITCH 6121-S11 IAW DHC-8-200 ENGINE RIG MANUAL PART 7, PARAGRAPH 4-4B, PAGES 7-21 TO 7-22. BETA LOCKOUT SYSTEM OPERATIONAL TEST GOOD. BETA BACKUP SYSTEM FUNCTION TEST GOOD. NR 1 ALTERNATE FEATHER/UNFEATHER TEST GOOD. AIRCRAFT RETURNED TO SERVICE.