FLC OF A LEAR JET 25 HAD ENG COMPRESSOR STALL AT FL410 AND COULD NOT RESTART ENG AT LOWER ALT RESULTING IN DIVERTING TO ANOTHER ARPT. AFTER FINDING CAUSE OF PROB AND MAKING REPAIRS; THE OTHER ENG LOST PWR AT SAME ALT AND LOCATION SEVERAL DAYS LATER. HOWEVER; ENG WAS RESTARTED AT LOWER ALT AND FLT CONTINUED TO DEST. CAUSE OF PROB WAS FOUND TO BE DIFFERENT FROM FIRST AND FIXED. NO SUBSEQUENT PROBS.

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ON JUN/XA/99 ON CLBOUT PASSING FL400 FOR FL410; L ENG COMPRESSOR STALLED. SHARPLY HIT MANUAL; IGNITER -- NO GOOD. DSNDED TO FL240 FOR RELIGHT -- NO GOOD. MADE SINGLE ENG LNDG AT ZZZ. FORWARD IGNITER BOX FAILED; IE; NO RELIGHT AND INLET GUIDE VANE CLIP MISSING. MAINT PERFORMED BY XYZ. ACFT PUT BACK INTO SVC ON JUN/XB/99 (NEXT FLT). ACFT LEFT ZZZ DIRECT MCN. NO PROBS AT FL330 MCN TO AT FL350 NO PROBS. RETURNING FROM CWF TO MLB ON THE SAME RTE AT THE SAME POINT 80 MI W OF MOB; THE R MOTOR ROLLS BACK AT FL410 MANUAL IGNITER; NO JOY. LET DOWN TO FL290. AIR START ENG RESPONDED. FLEW ON TO MLB AT FL330; NO FURTHER PROBS. ENG RAN GREAT. HOW BEGAN THAT WITHIN 2 FLTS; BOTH ENGS WOULD COMPRESSOR STALL AND NOT THE SAME ONE. AN IN-DEPTH INVESTIGATION IS PROGRESSING AT THIS TIME. NO ANSWERS YET. JUST LUCKY THEY DID NOT OUT AT THE SAME TIME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE FIRST (L) ENG COMPRESSOR STALL WAS DETERMINED TO BE CAUSED BY AN INLET VANE GUIDE CLIP COMING LOOSE AND ALLOWING THE INLET GUIDE STATOR VANE TO MOVE MORE THAN 3 1/2 DEGS AFTER REACHING FL410. THEY COULD NOT RESTART ENG; EVEN AT THE LOWER ALT DUE TO A FAILURE OF THE NON CONTINUOUS IGNITER BOX. THE SECOND ENG (R) LOST PWR SEVERAL DAYS LATER; AT THE SAME ALT (FL410); WAS CAUSED BY A COMPRESSOR GUIDE VANE FUEL LINE SEAL LEAK. THE ENG HAD JUST RECEIVED A DETAILED 600 HR INSPECTION A FEW HRS PRIOR TO THE GUIDE VANE FUEL LEAK. THE RPTR FLT TESTED THE ACFT AT FL410 THROUGH FL450 AND FOUND NO PROBS; OR ANY PROBS ON SUBSEQUENT TRIPS.