Muni’s oft-debated efforts to reroute bus lines in the wake of the department’s $129 million budget deficit will be discussed in detail at a community forum on Monday.

As a way to save money and make the lines more efficient, Muni has combined, cut, or extended the service on several of its transit routes, with the changes going into effect sometime next month.

Some of the proposed changes, such as alterations to the 41-Union, and the 2-Clement have been far from popular with local residents.

On Monday, Muni program manager Julie Kirschbaum will give an update on the service changes at the headquarters of SPUR, a local think-tank. The meeting is scheduled for 12:30 p.m. at SPUR’s office on 654 Mission Street.