Tekno Neu melted wires

[Nek]

Well I converted my revo to brushless some months ago and am running a finned 1515 1.5D 2700kv Tekno RC Neu along with an MMM on 4S.

I have probably had something like 20-30 packs in it with temps well within range. Last time I ran was in my backyard to make my dogs run a bit, so I was pushing it pretty hard cause I didn't want my 3 rottweilers to get ahold of my truck Everything was fine.

Today I ran like half a pack (2S2P Losi hardcase 5000mAh) in it cause I forgot to fully charge it, LVC pops on. And when I pop the body off I notice that my packs are really warmer than usual, nothing crazy tho. BUT my motor wires melted, all three of them on about 4-5cm!!! Motor was burning hot aswell. MMM didn't even have its fan on, was warm as usual...

Any idea what happened? Will I be fine if I just put some heatshrink back on the wires?

thx for any help