I just have a line that runs across my tv

This sounds like a panel issue unfortunately, if its under warranty or you purchased an extended warranty great, if not your kind of SOL

I have the same problem...

In most of the case, the problem is a defective display panel.

Yes, the lamp will gradually get darker as it nears it's end. The rolling lines sounds more like the set is on a local channel for the cable hook up. If your local area has a channel 3 or 4 live terestrial broadcast simply tune the cable box output to the other one, the same for the tv.
If this is cable/local broadcast issue it will go away in Febuary when the NTSC broadcast ends.

my screen on my mitsubishi won't stop rolling

does any one can send me the schematic of TOSHIBA 32A40? I have a vertical problem and I need to locate the vertical IC or trancistor.
I only see a horizontal line on my Tv.

thanks.
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i also have 2 horizonatl lines that roll about a foot apart up the screen...
i have been told twice now by two different people that it is a cable grounding problem, so if you have cable tv call the company and tell them what it is doing, i was informed they are aware of this problem and can install a filter at the main cable in line and this should solve this problem...which since i just had this looked at this morning i am going to be calling the cable company today!
hope this helps

Replace all electrolitic capacitors on the Proscan pcb.

Sounds like the flyback transformer is bad. couple of 100 dollars if it is that

this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!