I'm looking for a reliable tradesperson to fix a running or weak flush in my toilet. The issue started recently and seems inconsistent, sometimes it flushes fine and other times it takes several pumps or doesn’t fully clear. Please include a brief assessment of potential causes (fill valve, flapper, siphon, or handle mechanism) and any parts that might need replacement. I prefer someone who can supply common replacement parts or clearly outline estimated costs before proceeding. Access is straightforward, and I’m aiming for a tidy, long-lasting repair with minimal disruption.