A door that reverses halfway down, a door that won't respond to the remote but will respond to the wall button, or a door that's suddenly loud where it used to be quiet - these point to different culprits on a 1987-era setup than they would on an older one. Reversing halfway usually traces to a misaligned sensor or a worn down-limit switch on the opener, not the spring. No remote response but working wall button points at the opener's receiver or the remote's battery, not the track. New grinding noise usually means a roller has worn out of round, which on a house this age is wear-and-tear, not installation trouble. We also get calls where the door simply won't budge by hand even with the opener disconnected - that's a broken spring, full stop, and it's the one failure mode where you shouldn't try to force it open yourself.