R22 pressures run a good bit lower than R410a.
A 100 deg F, R22 = <200 PSI whereas R410a = >300 PSI.
One of the main problems with the change over to R410a has been it's pressure.
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Okay Shelby.. I hope the techs turned off both service valves when they found the indoor leak.
Otherwise all the R410a in the system will have vented into your home.
When they change out the indoor unit, perhaps they will check the flares
on both ends of the line-set and insure they are torqued to spec.
(I use Refrigeration Technologies RT201B NYLOG sealant on flares).
They will most likely Recover any remaining R410a, pressure test and then vacuum the system..
Before they re-charge the system with new R410a, using a scale, to weigh it in..
You should be able to find some MS install videos on YouTube, so you will
have a better idea of what the installers are doing at each step..