As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POST SHOP REPAIR OF ENGINE S/N P700543 , OPERATIONAL TEST FLIGHT UNSATISFACTORY. ENGINE EXHIBITS CONTINUOUS COMPRESSOR STALLS AT TOP OF CLIMB, 37FL. ACCOMPLISHED UNSCHEDULED RETURN TO FIELD. ENGINE TO BE REMOVED FROM AIRPLANE AND PLACED IN SHOP FOR DISCREPANCY CAUSE AND REPAIR.