why is wall voltage measuring 175V?
At 120 \$V_{rms}\$ your peak voltage should be \$\sqrt{2}*120=169.7\$  -> ~\$170\$ so you must have a peak hold function on that DMM.

It's either that or all the appliance you have plugged into that circuit are exploding around you ... becasue 175 \$V_{rms}\$ represents a 2X factor in power, most appliances would have problems with that.

update: after posting the manual, it's apparent that this DMM does not have a \$V_{peak}\$ ability.  The natural conclusion is that the DMM is not functioning properly.