[Jackflash]

Took a ridiculously long time to gather the parts necessary to perform the recommended tests but I finally got it done.  I pressured up the Aquahot side of the system and found this.        That's the incoming line from the engine were it turns up and then horizontal to enter the tank.  The sweated joint at the elbow has lost it's seal,. coolant was streaming out at a fast drip under 12 or 13 PSI.  I placed a small stick against the underside of the line between the elbow and the tank to make sure the liquid wasn't running down the line from the tank.  I'm wondering if this is something that can be fixed in place or am I going to have to remove the unit to re-sweat the joint.  My experience with sweating pipe is it's tough to get a good joint without disassembling the joint, removing the solder so that you have clean surfaces, fluxing and re-sweating.  once I found this I haven't bothered with running the engine to test those lines, think it's an issue?