Ice Cream maker unit having freeze time errors, cleaned dust buildup from condenser air filter. Also touch-pad clean button dead display good. Will order membrane switch. 7/31/18 Follow the- Existing membrane switch, no buttons working. Replaced membrane switch, still no change.Will order display board. No charge per service manager. 8/14/18 Follow up - Replaced display board module and started unit, manager says not freezing product. Sight glass full, checked pressures in freeze mode, found high side at 120 psi, low side 120 psi - compressor not pumping properly, low side drops 5 psi, then comes back up, condenser clean as well as filter recovered charge. Unit properly charged. Spoke with manager who called Dave facilities manager. Also left message with Shielding tech support, compressor possibly under warranty.