Yeah there's no rush on the hack.
I'm just going through the DC accuracy with my hacked SPD33003X and sdm3065X. The PSU is holding up well. A few of the scope channels are maybe a bit over the 3% of range setting, but maybe not if it's averaged. Like on 2V/div, no offset, currently 101mV on PSU, the mean value on ch2, the average is around 165mV, and it's jumping between say 140mV to 180.
A moment ago, ch3 was average ~160mV mean value, but now it's settled ~140mV, but I still see 170mV pop up on the mean value. It's been on ~2hrs.
Still on 2V/div, no offset, 652mV PSU, ch2 is ~700mV average, so just under the 60mV=3%.
At 6.101V, ch2 looks like ~6.18V average of the displayed mean, but I see 6.19xxx popping in. The other channels have ~6.10, 6.04, 6.06V
Now ~5-10min later, ch2 is ~6.16V average of the displayed mean. They're are all on 20MBW, 1x probes, 2us/div, 10bit, 50Mpts.
IDK how typical all this is, but like someone said on here, scopes aren't meant to be "precision" instruments. I've swapped probes around, and that made no real difference.
The lower ranges seemed in spec, most being no worse than 1.5-2%.