We don't have a published maintenance price to quote you here, and we're not going to guess one to fill space. What we can tell you is what drives the cost up or down: whether the door is single or double, whether the opener needs attention alongside the door, and whether we find a part at end of life during the visit versus one that just needs grease and adjustment.
Mount Pleasant households run a median income around $90,189, a touch below the wider Kenosha service area's $92,803, which doesn't change what the work costs but it's worth knowing we quote the job in front of you before touching anything, not after. For an exact number, call and describe what the door's doing - sticking, grinding, dropping unevenly - and we'll price from that.