Just open it and see if any of the big capacitors are flat or rounded (like a dome) at the top or leaking anything out the bottom. It's probably fine, and if not it's not a big deal to replace them yourself if it's anything like the ones that go in tv/monitor power circuits. Will be heaps of videos on how to remove and replace caps, and even specific ones for ecus based on a quick google search. I wouldn't bother spending money to have it checked (imo).
Ok I've found a replacement ECU that has been repaired. Just looked up whats involved in swapping it around. What a mission!
I also want to "fix" my brakes. They feel soft compared to newer cars. The pads are good quality but I'm getting the brake lines flushed and refilled today. If that doesnt do it, I'd be keen to spend a bit on a new set like this http://www.mrpltd.co.nz/product/coro...big-brake-kit/ or something.
New ECU inbound
Just had it serviced as brakes were soft as ****. Now braking much better. Thinking of overhauling all the brakes to be honest. Saw some kits for like 1K.
Only things that need doing really now are:
ECU, both front wheel bearings and CV boots.
I wouldn't have thought it'd be that much of a mission to pull out the ECU, most Toyotas just have it sitting behind the passenger kickpanel. Is it auto or manual? A lot of Toyota ECU related issues are with auto transmissions, manual trans ECUs tend to fail less often.
And 1k seems like an awful lot to spend on a brake upgrade for a Corolla given if you're replacing calipers etc you'll need to get it certified (which is an additional $495 at least). If you're no racer as you said above just leave it as it is. You might find when you pull out the old ECU that it's fine so at least you can flick that off or recap and keep as spare