As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE HAD SINGLE COMPRESSOR STALL ON LEVEL OFF AT FL 410. WORKED FINE BEFORE AND AFTER STALL. T/S PER FIM 71-05-00 FIG 103, PER BLOCK 9 FOUND 2.9 BLEED SOLENOID BAD. REMOVED AND REPLACED 2.9 BLEED SOLENOID. BORESCOPE OF ENGINE FOUND NO DEFECTS. RAN ENGINE PER PFHB TEST 4. ENGINE TEST GOOD.