What was found
NR 2 ENG AUTO ABORTED DURING START WITH APU. STARTED TO LOOK NORMAL IN FIRST 35 SECS, THEN SPIKED. NO OTHER IND OR EICAS MESSAGES. ITT WAS IN RED FOR NO MORE THAN 2 SECS. ATTEMPTED 2ND START AT GATE, N2 DID NOT GO OVER 0.2, AFTER 30 SECS ABORTED START MANUALLY. RAMP REPORTED SMOKE FROM BOTTOM OF NR 2 ENG. (PREVIOUS CREW REPORTED SIMULAR ISSUES WITH SAME ENG, AUTO ABORT & NP N2 RISE). REMOVED FROM SERVICE. IN TERAGATED CMC FOUND FAULT CODE 73216218E2A. NO EXCEEDANCE NOTED ON ENG MTX PAGE IN CMC. NO OTHER FAULTS NOTED OTHER THAN FAULT. COMPLIED WITH GE LMM FAULT ISOLATION TASK 72-00-00-810-806, SUBTASK 72-00-00-810-806, SUBTASK 72-00-00-810-091. NO MTX REQUIRED FOR HOT START ABORT. R & R NR 2 ATS IAW AMM 80-10-01-000-801-A & 80-10-01-400-801-A. AS A PRECAUTION, REPLACED NR 2 STARTER CONTROL VALVE IAW AMM 80-10-02-000-801-A & 80-10-02-400-801-A. PERFORMED 2 ENG STARTS . OPS & LEAK CHKD GOOD. START TEMPS NORMAL. NO FAULTS RETURNED. RETURNED TO SERVICE.