2004 Hummer H3 some sys. won't work.

before problem happened when some technician replace rubber bushing of lower arm. because of hard to dismount the bushing they do some hammering work on that to remove. then the unit done they return to the owner. 2 or 1 month the unit come back with ABS and traction lights on. the worst happened is somethings wrong. the air-conditioning not function, four power windows won't work and the engine lack of power.