DC-in repair or replace?

(apologies if this is a duplicate post -- looks like my original post didn't actually go through!)

I'm having trouble with getting my iBook to charge properly. I replaced the power supply a year or so ago and have had relative success with it since then. I have noticed over the last few months, though, that it's increasingly difficult to find the "sweet spot" where the connection is right to get the power supply to be recognized. Often, it's plugged in, the light ring is amber, but the iBook thinks its running on batter power. Sometimes it cycles (rapidly) between thinking it's plugged in/on battery/plugged in/on battery.

I realize this is generally not good for the machine, so am ready to take action.

I'm assuming this is a DC-in issue. My question is whether I may be able to repair the DC-in component, or whether this is something that simply needs to be replaced when it starts to fail? Are there connections I can check?

I've already taken this iBook down to its guts and replaced the hard drive, so I'm not worried about the work, just wondering whether it's worth the effort to open it up and try to repair, or whether I should just order the replacement part?

Thanks!!