Sand was changed at the beginning of the season, just prior to letting the PB go. PB claimed he checked the laterals at that time and all was well. They could have crushed / dislocated one or more while filling with sand, I suppose.

Y'all have convinced me not to upgrade my pump to a 1.5 HP and I certainly don't want to change the plumbing from 1.5 to 2 inches.

With the pump motor being so rusty, I really can't tell what was originally installed, whether it was a 1.65 service factor of a 1.25 service factor.

After reading what y'all have written, I think I'll be safe and go with the 1.25 service factor, 1 HP motor, AO Smith SQC1102. They claim it's energy efficient, drawing only 6.3 amps as compared to the 7.4 amps of the non-energy efficient pump.