HOUSTON Lawyers for late Enron founder Kenneth Lay took their first official step today toward erasing his felony convictions. Lay died last month in Colorado of heart problems. He was 64. Lay was convicted May 25th of fraud and conspiracy in the federal government's foremost criminal trial to emerge from Houston-based Enron's flameout. His co-defendant, former Enron C-E-O Jeffrey Skilling, was convicted of 19 counts of fraud, conspiracy, insider trading and lying to auditors. Lay's death came before he had appealed or been sentenced, so his legal team can ask U-S District Judge Sim Lake to wipe his record clean. But first, Lake has to approve substituting -Lay's estate- for -Lay himself- so the entity can act on the late businessman's behalf. That court filing came today.