REBUILDING THE BRONX: Bronx resident and first-time homebuyer Keyla Guerrero is transforming a fixer-upper co-op into a family home after buying it at a lower price because it needed major repairs. She received nearly $40,000 through a 15-year NYC affordable housing forgivable loan to help with purchase and renovation costs. Before closing, she worked with Bronx Neighborhood Housing Services, which provides first-time homebuyer assistance, home retention support and free tax preparation. Watch N