What was found
WENT TO FIREWALL POWER ON TCAS ALERT AT 5000 FT, FIREWALL POWER LESS THAN 10 SECS. IN WORK ADDITIONAL TSI 34-55-6491 ISSUED TO REMOVE TCAS PROCESSOR FOR BENCH DOWNLOAD/READOUT. ADDITIONAL TSI 23-70-6490 ISSUED TO REMOVE CVR FOR BENCH READOUT. PER VERBAL INFO A/C WAS AT 5000 LEVEL. INTRUDER SINGLE ENG WAS AT 4000 AND CLIMBING. TYS TOWER CONFIRMED. 99 DAY HISTORY SHOWS NO TCAS RA PROBLEMS. COMPLETED INLET/EXHAUST INSPECTION AND FIREWALL AND/OR EMERGENCY ESCAPE CHECK PER JRH 6-38. ALL CHECKS OK, RETURNED TO SERVICE PER EA 7-7200-78554.