As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O ENGINE NR1 HAD A COMPRESSOR STALL. TORQUE SPIKED 10 PERCENT. PERFORMED GROUND RUN PERFORMANCE CHECK NR1 ENG IAW ATR72 JIC 72-00-00-ERU 10040. NO DEFECTS NOTED. CANNOT DUPLICATE. ACFT TAKEN OUT OF SERVICE FOR SUSPECTED COMPRESSOR STALLS ON NR1 ENG. R & R NR1 ENGINE INTER COMPRESSOR BLEED VALVE (IBV) AND (IBV) SERVO VALVE ON NR1 ENGINE IAW MM 72-01-30. ENGINE NR1 GROUND RUN, NR1 ENG IBV AND SERVO VALVE. OPS TEST GOOD IAW MM 72-01-30.