LOS ANGELES — The Treasury Department lobbed back a new offer to Chrysler LLC's lenders, proposing that banks and hedge funds which hold $6.9 billion in debt forgive $5.4 billion in exchange for a 5 percent stake in a Chrysler-Fiat alliance, media reports said late Wednesday. The new offer represents payment of 22 percent of the debt lenders are owed, according to a report by The Wall Street Journal.