The shoebox blew a fuse tonight as soon as turned it on.
I tried moving the crank arm by hand and could not.
A bit of disassembly later, and I've found the upper piston is locked up tight and I can not get it to budge.
I've been filling a my 44cf tank, lubing after every +/- 4 hours of run time. I've got about 12-16 hours of time on the compressor.
Was running fine when I shut down last evening.