What was found
AT FL330 THE LEFT ENGINE EPR GAUGE FROZE, ALL OTHER INDICATIONS NORMAL - N1, N2, EGT. CHECKED PT2 AND PT7 LINES FOR BLOCKAGE AND LEAK CHECKED FROM ENGINE TO TRANSMITTER, REFERENCE DC9 MAINTENANCE MANUAL 77-11-0. MEGGED ALL WIRES, DID A THOROUGH INSPECTION OF CONNECTORS AND NO DEFECT NOTED IN ACCORDANCE WITH MAINTENANCE MANUAL 77-11-00. REPLACED LEFT ENGINE PRESSURE RATIO CIRCUIT BREAKER AND TRANSMITTER. OPERATION CHECK GOOD.